diff --git a/Base/home/anon/.config/SystemServer.ini b/Base/home/anon/.config/SystemServer.ini
index 6099e3d501..874d08342e 100644
--- a/Base/home/anon/.config/SystemServer.ini
+++ b/Base/home/anon/.config/SystemServer.ini
@@ -1,9 +1,9 @@
 [ConfigServer]
-Socket=/tmp/user/%uid/portal/config
+Socket=/tmp/session/%sid/portal/config
 SocketPermissions=600
 
 [RequestServer]
-Socket=/tmp/user/%uid/portal/request
+Socket=/tmp/session/%sid/portal/request
 SocketPermissions=600
 Lazy=true
 Priority=low
@@ -12,7 +12,7 @@ MultiInstance=true
 AcceptSocketConnections=true
 
 [WebContent]
-Socket=/tmp/user/%uid/portal/webcontent
+Socket=/tmp/session/%sid/portal/webcontent
 SocketPermissions=600
 Lazy=true
 SystemModes=graphical
@@ -20,7 +20,7 @@ MultiInstance=true
 AcceptSocketConnections=true
 
 [WebSocket]
-Socket=/tmp/user/%uid/portal/websocket
+Socket=/tmp/session/%sid/portal/websocket
 SocketPermissions=600
 Lazy=true
 Priority=low
@@ -29,7 +29,7 @@ MultiInstance=true
 AcceptSocketConnections=true
 
 [FileSystemAccessServer]
-Socket=/tmp/user/%uid/portal/filesystemaccess
+Socket=/tmp/session/%sid/portal/filesystemaccess
 SocketPermissions=660
 Lazy=true
 Priority=low
@@ -38,7 +38,7 @@ MultiInstance=true
 AcceptSocketConnections=true
 
 [ImageDecoder]
-Socket=/tmp/user/%uid/portal/image
+Socket=/tmp/session/%sid/portal/image
 SocketPermissions=600
 Lazy=true
 SystemModes=graphical
@@ -46,46 +46,46 @@ MultiInstance=true
 AcceptSocketConnections=true
 
 [NotificationServer]
-Socket=/tmp/user/%uid/portal/notify
+Socket=/tmp/session/%sid/portal/notify
 SocketPermissions=600
 Lazy=true
 Priority=low
 KeepAlive=true
 
 [InspectorServer]
-Socket=/tmp/user/%uid/portal/inspector,/tmp/user/%uid/portal/inspectables
+Socket=/tmp/session/%sid/portal/inspector,/tmp/session/%sid/portal/inspectables
 SocketPermissions=600,666
 KeepAlive=true
 
 [AudioServer]
-Socket=/tmp/user/%uid/portal/audio
+Socket=/tmp/session/%sid/portal/audio
 Priority=high
 KeepAlive=true
 SystemModes=text,graphical
 
 [CppLanguageServer]
-Socket=/tmp/user/%uid/portal/language/cpp
+Socket=/tmp/session/%sid/portal/language/cpp
 SocketPermissions=600
 Lazy=true
 MultiInstance=true
 AcceptSocketConnections=true
 
 [ShellLanguageServer]
-Socket=/tmp/user/%uid/portal/language/shell
+Socket=/tmp/session/%sid/portal/language/shell
 SocketPermissions=600
 Lazy=true
 MultiInstance=true
 AcceptSocketConnections=true
 
 [SQLServer]
-Socket=/tmp/user/%uid/portal/sql
+Socket=/tmp/session/%sid/portal/sql
 SocketPermissions=600
 Priority=low
 Lazy=true
 KeepAlive=true
 
 [LaunchServer]
-Socket=/tmp/user/%uid/portal/launch
+Socket=/tmp/session/%sid/portal/launch
 SocketPermissions=600
 Lazy=true
 SystemModes=text,graphical
@@ -126,4 +126,3 @@ KeepAlive=true
 
 [Terminal]
 WorkingDirectory=/home/anon
-
diff --git a/Userland/Applets/Audio/main.cpp b/Userland/Applets/Audio/main.cpp
index 10a7b674f1..d5b0b41478 100644
--- a/Userland/Applets/Audio/main.cpp
+++ b/Userland/Applets/Audio/main.cpp
@@ -237,12 +237,13 @@ private:
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath wpath cpath unix thread"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath wpath cpath unix thread proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
     Config::pledge_domain("AudioApplet");
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/audio", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/audio", "rw"));
     TRY(Core::System::unveil("/res", "r"));
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto window = TRY(GUI::Window::try_create());
diff --git a/Userland/Applets/ClipboardHistory/main.cpp b/Userland/Applets/ClipboardHistory/main.cpp
index 0902ccb8c2..913f203eca 100644
--- a/Userland/Applets/ClipboardHistory/main.cpp
+++ b/Userland/Applets/ClipboardHistory/main.cpp
@@ -17,7 +17,7 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix proc"));
     auto app = TRY(GUI::Application::try_create(arguments));
 
     Config::pledge_domain("ClipboardHistory");
diff --git a/Userland/Applets/Network/main.cpp b/Userland/Applets/Network/main.cpp
index f26d2af880..fc2b0f9465 100644
--- a/Userland/Applets/Network/main.cpp
+++ b/Userland/Applets/Network/main.cpp
@@ -166,8 +166,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::pledge("stdio recvfd sendfd rpath unix proc exec"));
     auto app = TRY(GUI::Application::try_create(arguments));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/notify", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/notify", "rw"));
     TRY(Core::System::unveil("/proc/net/adapters", "r"));
     TRY(Core::System::unveil("/bin/SystemMonitor", "x"));
     TRY(Core::System::unveil(nullptr, nullptr));
diff --git a/Userland/Applications/3DFileViewer/main.cpp b/Userland/Applications/3DFileViewer/main.cpp
index 0185927ea5..1b77bd6107 100644
--- a/Userland/Applications/3DFileViewer/main.cpp
+++ b/Userland/Applications/3DFileViewer/main.cpp
@@ -358,9 +358,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
     auto app = TRY(GUI::Application::try_create(arguments));
 
-    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath unix prot_exec"));
+    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath unix prot_exec proc"));
 
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/home/anon/Documents/3D Models", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/usr/lib", "r"));
diff --git a/Userland/Applications/Browser/main.cpp b/Userland/Applications/Browser/main.cpp
index 611e8bd9f0..5168b37785 100644
--- a/Userland/Applications/Browser/main.cpp
+++ b/Userland/Applications/Browser/main.cpp
@@ -80,14 +80,16 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_url(URL::create_with_file_scheme(Core::StandardPaths::downloads_directory())));
     TRY(Desktop::Launcher::seal_allowlist());
 
+    TRY(Core::System::unveil("/proc/all", "r"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/image", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/request", "rw"));
     TRY(Core::System::unveil("/home", "rwc"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/etc/passwd", "r"));
     TRY(Core::System::unveil("/etc/timezone", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/image", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/request", "rw"));
     TRY(Core::System::unveil("/bin/BrowserSettings", "x"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
diff --git a/Userland/Applications/Help/main.cpp b/Userland/Applications/Help/main.cpp
index fbf4f83c54..20ca37a36c 100644
--- a/Userland/Applications/Help/main.cpp
+++ b/Userland/Applications/Help/main.cpp
@@ -28,14 +28,15 @@ static String parse_input(StringView input)
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix proc"));
     auto app = TRY(GUI::Application::try_create(arguments));
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/usr/share/man", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     String start_page;
diff --git a/Userland/Applications/HexEditor/main.cpp b/Userland/Applications/HexEditor/main.cpp
index 5dbf1e1c89..a1b71b02a9 100644
--- a/Userland/Applications/HexEditor/main.cpp
+++ b/Userland/Applications/HexEditor/main.cpp
@@ -20,7 +20,7 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix cpath wpath thread"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix cpath wpath thread proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
 
@@ -43,8 +43,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         return GUI::Window::CloseRequestDecision::StayOpen;
     };
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     hex_editor_widget->initialize_menubar(*window);
diff --git a/Userland/Applications/Magnifier/main.cpp b/Userland/Applications/Magnifier/main.cpp
index eae5a156a0..bc0b67dd85 100644
--- a/Userland/Applications/Magnifier/main.cpp
+++ b/Userland/Applications/Magnifier/main.cpp
@@ -37,11 +37,11 @@ static ErrorOr<ByteBuffer> dump_bitmap(RefPtr<Gfx::Bitmap> bitmap, AK::StringVie
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio cpath rpath recvfd sendfd unix"));
+    TRY(Core::System::pledge("stdio cpath rpath recvfd sendfd unix proc"));
     auto app = TRY(GUI::Application::try_create(arguments));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = GUI::Icon::default_icon("app-magnifier"sv);
diff --git a/Userland/Applications/Mail/main.cpp b/Userland/Applications/Mail/main.cpp
index a14e2629c3..a563676a82 100644
--- a/Userland/Applications/Mail/main.cpp
+++ b/Userland/Applications/Mail/main.cpp
@@ -18,17 +18,18 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix inet"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix inet proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
 
     Config::pledge_domain("Mail");
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/etc", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
     TRY(Core::System::unveil("/tmp/portal/lookup", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     TRY(Desktop::Launcher::add_allowed_url(URL::create_with_file_scheme("/bin/MailSettings")));
diff --git a/Userland/Applications/PDFViewer/main.cpp b/Userland/Applications/PDFViewer/main.cpp
index 67f9dda8dc..deb25f7934 100644
--- a/Userland/Applications/PDFViewer/main.cpp
+++ b/Userland/Applications/PDFViewer/main.cpp
@@ -32,10 +32,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     window->set_title("PDF Viewer");
     window->resize(640, 400);
 
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto pdf_viewer_widget = TRY(window->try_set_main_widget<PDFViewerWidget>());
diff --git a/Userland/Applications/PixelPaint/main.cpp b/Userland/Applications/PixelPaint/main.cpp
index bb73e1e4a8..f7669143f8 100644
--- a/Userland/Applications/PixelPaint/main.cpp
+++ b/Userland/Applications/PixelPaint/main.cpp
@@ -21,7 +21,7 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath unix wpath cpath"));
+    TRY(Core::System::pledge("stdio thread recvfd sendfd rpath unix wpath cpath proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
     Config::pledge_domain("PixelPaint");
@@ -31,10 +31,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_positional_argument(image_file, "Image file to open", "path", Core::ArgsParser::Required::No);
     args_parser.parse(arguments);
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/tmp/portal/clipboard", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/image", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/image", "rw"));
     TRY(Core::System::unveil("/etc/FileIconProvider.ini", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
diff --git a/Userland/Applications/Spreadsheet/main.cpp b/Userland/Applications/Spreadsheet/main.cpp
index 7b523f1aed..9d40dc9117 100644
--- a/Userland/Applications/Spreadsheet/main.cpp
+++ b/Userland/Applications/Spreadsheet/main.cpp
@@ -26,7 +26,7 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath fattr unix cpath wpath thread"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath fattr unix cpath wpath thread proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
 
@@ -44,7 +44,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         }
     }
 
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
     // For writing temporary files when exporting.
     TRY(Core::System::unveil("/tmp", "crw"));
     TRY(Core::System::unveil("/etc", "r"));
diff --git a/Userland/Applications/Terminal/main.cpp b/Userland/Applications/Terminal/main.cpp
index d6b147652a..925a07a8db 100644
--- a/Userland/Applications/Terminal/main.cpp
+++ b/Userland/Applications/Terminal/main.cpp
@@ -422,6 +422,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         return GUI::Window::CloseRequestDecision::StayOpen;
     };
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/bin", "r"));
     TRY(Core::System::unveil("/proc", "r"));
@@ -429,8 +430,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/bin/TerminalSettings", "x"));
     TRY(Core::System::unveil("/bin/utmpupdate", "x"));
     TRY(Core::System::unveil("/etc/FileIconProvider.ini", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/config", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/config", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto modified_state_check_timer = Core::Timer::create_repeating(500, [&] {
diff --git a/Userland/Applications/TextEditor/main.cpp b/Userland/Applications/TextEditor/main.cpp
index e1f4e73ace..0bd82d9d1e 100644
--- a/Userland/Applications/TextEditor/main.cpp
+++ b/Userland/Applications/TextEditor/main.cpp
@@ -18,7 +18,7 @@ using namespace TextEditor;
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd thread rpath cpath wpath unix"));
+    TRY(Core::System::pledge("stdio recvfd sendfd thread rpath cpath wpath unix proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
 
@@ -31,10 +31,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     parser.add_positional_argument(file_to_edit, "File to edit, with optional starting line and column number", "file[:line[:column]]", Core::ArgsParser::Required::No);
     parser.parse(arguments);
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = GUI::Icon::default_icon("app-text-editor"sv);
diff --git a/Userland/Applications/ThemeEditor/main.cpp b/Userland/Applications/ThemeEditor/main.cpp
index 87051fa308..0430bd8adc 100644
--- a/Userland/Applications/ThemeEditor/main.cpp
+++ b/Userland/Applications/ThemeEditor/main.cpp
@@ -38,8 +38,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     if (!file_to_edit.is_empty())
         path = Core::File::absolute_path(file_to_edit);
 
-    TRY(Core::System::pledge("stdio recvfd sendfd thread rpath unix"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::pledge("stdio recvfd sendfd thread rpath unix proc"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
diff --git a/Userland/Applications/Welcome/main.cpp b/Userland/Applications/Welcome/main.cpp
index d96e75d67a..4598b0e102 100644
--- a/Userland/Applications/Welcome/main.cpp
+++ b/Userland/Applications/Welcome/main.cpp
@@ -19,10 +19,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     Config::pledge_domain("SystemServer");
 
+    TRY(Core::System::unveil("/proc/all", "r"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/webcontent", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/home", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/webcontent", "rw"));
     TRY(Core::System::unveil("/bin/Help", "x"));
     TRY(Core::System::unveil(nullptr, nullptr));
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-welcome"sv));
diff --git a/Userland/Demos/Eyes/main.cpp b/Userland/Demos/Eyes/main.cpp
index 4f4e9c1de0..c7e183cc89 100644
--- a/Userland/Demos/Eyes/main.cpp
+++ b/Userland/Demos/Eyes/main.cpp
@@ -36,12 +36,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_option(hide_window_frame, "Hide window frame", "hide-window", 'h');
     args_parser.parse(arguments);
 
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix cpath wpath thread"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix cpath wpath thread proc"));
 
     auto app = TRY(GUI::Application::try_create(arguments));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     if ((grid_rows > 0) ^ (grid_columns > 0)) {
diff --git a/Userland/Demos/WidgetGallery/main.cpp b/Userland/Demos/WidgetGallery/main.cpp
index 7c7681ec86..0c0bb64cd1 100644
--- a/Userland/Demos/WidgetGallery/main.cpp
+++ b/Userland/Demos/WidgetGallery/main.cpp
@@ -14,11 +14,11 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix thread"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath unix thread proc"));
     auto app = TRY(GUI::Application::try_create(arguments, Core::EventLoop::MakeInspectable::Yes));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/etc/FileIconProvider.ini", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-widget-gallery"sv));
diff --git a/Userland/DevTools/HackStudio/LanguageClients/ConnectionsToServer.h b/Userland/DevTools/HackStudio/LanguageClients/ConnectionsToServer.h
index a32aa84747..efdbf9d5d8 100644
--- a/Userland/DevTools/HackStudio/LanguageClients/ConnectionsToServer.h
+++ b/Userland/DevTools/HackStudio/LanguageClients/ConnectionsToServer.h
@@ -15,7 +15,7 @@
 #define LANGUAGE_CLIENT(language_name_, socket_name)                                                    \
     namespace language_name_ {                                                                          \
     class ConnectionToServer final : public HackStudio::ConnectionToServer {                            \
-        IPC_CLIENT_CONNECTION(ConnectionToServer, "/tmp/user/%uid/portal/language/" socket_name)        \
+        IPC_CLIENT_CONNECTION(ConnectionToServer, "/tmp/session/%sid/portal/language/" socket_name)     \
     public:                                                                                             \
         static char const* language_name() { return #language_name_; }                                  \
                                                                                                         \
diff --git a/Userland/DevTools/Inspector/InspectorServerClient.h b/Userland/DevTools/Inspector/InspectorServerClient.h
index db2e9d994b..a67148117a 100644
--- a/Userland/DevTools/Inspector/InspectorServerClient.h
+++ b/Userland/DevTools/Inspector/InspectorServerClient.h
@@ -15,7 +15,7 @@ namespace Inspector {
 class InspectorServerClient final
     : public IPC::ConnectionToServer<InspectorClientEndpoint, InspectorServerEndpoint>
     , public InspectorClientEndpoint {
-    IPC_CLIENT_CONNECTION(InspectorServerClient, "/tmp/user/%uid/portal/inspector"sv)
+    IPC_CLIENT_CONNECTION(InspectorServerClient, "/tmp/session/%sid/portal/inspector"sv)
 
 public:
     virtual ~InspectorServerClient() override = default;
diff --git a/Userland/Games/2048/main.cpp b/Userland/Games/2048/main.cpp
index c248af6b5d..50678843c4 100644
--- a/Userland/Games/2048/main.cpp
+++ b/Userland/Games/2048/main.cpp
@@ -28,7 +28,7 @@
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd unix"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd unix proc"));
 
     srand(time(nullptr));
 
@@ -44,8 +44,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     size_t board_size = Config::read_i32("2048"sv, ""sv, "board_size"sv, 4);
diff --git a/Userland/Games/Chess/main.cpp b/Userland/Games/Chess/main.cpp
index 8d58b3f187..d2ecb26b90 100644
--- a/Userland/Games/Chess/main.cpp
+++ b/Userland/Games/Chess/main.cpp
@@ -36,11 +36,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     auto window = TRY(GUI::Window::try_create());
     auto widget = TRY(window->try_set_main_widget<ChessWidget>());
 
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/bin/ChessEngine", "x"));
-    TRY(Core::System::unveil("/etc/passwd", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto size = Config::read_i32("Chess"sv, "Display"sv, "size"sv, 512);
diff --git a/Userland/Games/FlappyBug/main.cpp b/Userland/Games/FlappyBug/main.cpp
index 377f45493c..1753c28d79 100644
--- a/Userland/Games/FlappyBug/main.cpp
+++ b/Userland/Games/FlappyBug/main.cpp
@@ -28,10 +28,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/FlappyBug.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     u32 high_score = Config::read_i32("FlappyBug"sv, "Game"sv, "HighScore"sv, 0);
diff --git a/Userland/Games/GameOfLife/main.cpp b/Userland/Games/GameOfLife/main.cpp
index 90ba811510..83ee6019e0 100644
--- a/Userland/Games/GameOfLife/main.cpp
+++ b/Userland/Games/GameOfLife/main.cpp
@@ -34,10 +34,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/GameOfLife.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-gameoflife"sv));
diff --git a/Userland/Games/Hearts/main.cpp b/Userland/Games/Hearts/main.cpp
index 95a818fad1..59787de4a6 100644
--- a/Userland/Games/Hearts/main.cpp
+++ b/Userland/Games/Hearts/main.cpp
@@ -40,10 +40,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/Hearts.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio recvfd sendfd rpath"));
+    TRY(Core::System::pledge("stdio recvfd sendfd rpath proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto window = TRY(GUI::Window::try_create());
diff --git a/Userland/Games/MasterWord/main.cpp b/Userland/Games/MasterWord/main.cpp
index ea279093de..32dc6347d2 100644
--- a/Userland/Games/MasterWord/main.cpp
+++ b/Userland/Games/MasterWord/main.cpp
@@ -30,10 +30,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/MasterWord.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-masterword"sv));
diff --git a/Userland/Games/Minesweeper/main.cpp b/Userland/Games/Minesweeper/main.cpp
index ad066e347e..b08805ab65 100644
--- a/Userland/Games/Minesweeper/main.cpp
+++ b/Userland/Games/Minesweeper/main.cpp
@@ -36,10 +36,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/Minesweeper.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-minesweeper"sv));
diff --git a/Userland/Games/Snake/main.cpp b/Userland/Games/Snake/main.cpp
index 9e0ece2679..0fe09541f5 100644
--- a/Userland/Games/Snake/main.cpp
+++ b/Userland/Games/Snake/main.cpp
@@ -31,10 +31,10 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Desktop::Launcher::add_allowed_handler_with_only_specific_urls("/bin/Help", { URL::create_with_file_scheme("/usr/share/man/man6/Snake.md") }));
     TRY(Desktop::Launcher::seal_allowlist());
 
-    TRY(Core::System::pledge("stdio rpath recvfd sendfd"));
+    TRY(Core::System::pledge("stdio rpath recvfd sendfd proc"));
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/launch", "rw"));
     TRY(Core::System::unveil("/res", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/launch", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     auto app_icon = TRY(GUI::Icon::try_create_default_icon("app-snake"sv));
diff --git a/Userland/Libraries/LibAudio/ConnectionToServer.h b/Userland/Libraries/LibAudio/ConnectionToServer.h
index 5ed42450fa..7abd516aa5 100644
--- a/Userland/Libraries/LibAudio/ConnectionToServer.h
+++ b/Userland/Libraries/LibAudio/ConnectionToServer.h
@@ -26,7 +26,7 @@ namespace Audio {
 class ConnectionToServer final
     : public IPC::ConnectionToServer<AudioClientEndpoint, AudioServerEndpoint>
     , public AudioClientEndpoint {
-    IPC_CLIENT_CONNECTION(ConnectionToServer, "/tmp/user/%uid/portal/audio"sv)
+    IPC_CLIENT_CONNECTION(ConnectionToServer, "/tmp/session/%sid/portal/audio"sv)
 public:
     virtual ~ConnectionToServer() override;
 
diff --git a/Userland/Libraries/LibConfig/Client.h b/Userland/Libraries/LibConfig/Client.h
index ff1c2d5207..1ab9e52ad1 100644
--- a/Userland/Libraries/LibConfig/Client.h
+++ b/Userland/Libraries/LibConfig/Client.h
@@ -18,7 +18,7 @@ namespace Config {
 class Client final
     : public IPC::ConnectionToServer<ConfigClientEndpoint, ConfigServerEndpoint>
     , public ConfigClientEndpoint {
-    IPC_CLIENT_CONNECTION(Client, "/tmp/user/%uid/portal/config"sv)
+    IPC_CLIENT_CONNECTION(Client, "/tmp/session/%sid/portal/config"sv)
 
 public:
     void pledge_domains(Vector<String> const&);
diff --git a/Userland/Libraries/LibCore/Account.cpp b/Userland/Libraries/LibCore/Account.cpp
index 4958f5bb2d..a88e63b5bd 100644
--- a/Userland/Libraries/LibCore/Account.cpp
+++ b/Userland/Libraries/LibCore/Account.cpp
@@ -68,15 +68,6 @@ ErrorOr<Account> Account::from_passwd(passwd const& pwd, spwd const& spwd)
     return account;
 }
 
-String Account::parse_path_with_uid(StringView general_path, Optional<uid_t> uid)
-{
-    if (general_path.contains("%uid"sv)) {
-        auto const final_uid = uid.has_value() ? uid.value() : getuid();
-        return general_path.replace("%uid"sv, String::number(final_uid), ReplaceMode::All);
-    }
-    return general_path;
-}
-
 ErrorOr<Account> Account::self([[maybe_unused]] Read options)
 {
     Vector<gid_t> extra_gids = TRY(Core::System::getgroups());
@@ -149,14 +140,6 @@ bool Account::authenticate(SecretString const& password) const
     return hash != nullptr && AK::timing_safe_compare(hash, m_password_hash.characters(), m_password_hash.length());
 }
 
-ErrorOr<void> Account::create_user_temporary_directory_if_needed() const
-{
-    auto const temporary_directory = String::formatted("/tmp/user/{}", m_uid);
-    auto directory = TRY(Core::Directory::create(temporary_directory, Core::Directory::CreateDirectories::Yes));
-    TRY(directory.chown(m_uid, m_gid));
-    return {};
-}
-
 ErrorOr<void> Account::login() const
 {
     TRY(Core::System::setgroups(m_extra_gids));
diff --git a/Userland/Libraries/LibCore/Account.h b/Userland/Libraries/LibCore/Account.h
index 54b432e4d5..9141282c58 100644
--- a/Userland/Libraries/LibCore/Account.h
+++ b/Userland/Libraries/LibCore/Account.h
@@ -32,7 +32,6 @@ public:
         PasswdOnly
     };
 
-    static String parse_path_with_uid(StringView general_path, Optional<uid_t> force_uid = {});
     static ErrorOr<Account> self(Read options = Read::All);
     static ErrorOr<Account> from_name(StringView username, Read options = Read::All);
     static ErrorOr<Account> from_uid(uid_t uid, Read options = Read::All);
@@ -40,8 +39,6 @@ public:
     bool authenticate(SecretString const& password) const;
     ErrorOr<void> login() const;
 
-    ErrorOr<void> create_user_temporary_directory_if_needed() const;
-
     String username() const { return m_username; }
     String password_hash() const { return m_password_hash; }
 
diff --git a/Userland/Libraries/LibCore/EventLoop.cpp b/Userland/Libraries/LibCore/EventLoop.cpp
index a7f7198622..60e5c96aeb 100644
--- a/Userland/Libraries/LibCore/EventLoop.cpp
+++ b/Userland/Libraries/LibCore/EventLoop.cpp
@@ -22,6 +22,7 @@
 #include <LibCore/LocalServer.h>
 #include <LibCore/Notifier.h>
 #include <LibCore/Object.h>
+#include <LibCore/SessionManagement.h>
 #include <LibThreading/Mutex.h>
 #include <LibThreading/MutexProtected.h>
 #include <errno.h>
@@ -361,7 +362,12 @@ EventLoop::~EventLoop()
 bool connect_to_inspector_server()
 {
 #ifdef __serenity__
-    auto inspector_server_path = Account::parse_path_with_uid("/tmp/user/%uid/portal/inspectables"sv);
+    auto maybe_path = SessionManagement::parse_path_with_sid("/tmp/session/%sid/portal/inspectables"sv);
+    if (maybe_path.is_error()) {
+        dbgln("connect_to_inspector_server: {}", maybe_path.error());
+        return false;
+    }
+    auto inspector_server_path = maybe_path.value();
     auto maybe_socket = Stream::LocalSocket::connect(inspector_server_path);
     if (maybe_socket.is_error()) {
         dbgln("connect_to_inspector_server: Failed to connect: {}", maybe_socket.error());
diff --git a/Userland/Libraries/LibCore/LocalServer.cpp b/Userland/Libraries/LibCore/LocalServer.cpp
index c37547c704..d246e2c8db 100644
--- a/Userland/Libraries/LibCore/LocalServer.cpp
+++ b/Userland/Libraries/LibCore/LocalServer.cpp
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <LibCore/Account.h>
 #include <LibCore/LocalServer.h>
 #include <LibCore/Notifier.h>
+#include <LibCore/SessionManagement.h>
 #include <LibCore/Stream.h>
 #include <LibCore/System.h>
 #include <LibCore/SystemServerTakeover.h>
@@ -38,7 +38,7 @@ ErrorOr<void> LocalServer::take_over_from_system_server(String const& socket_pat
     if (m_listening)
         return Error::from_string_literal("Core::LocalServer: Can't perform socket takeover when already listening");
 
-    auto const parsed_path = Core::Account::parse_path_with_uid(socket_path);
+    auto const parsed_path = TRY(Core::SessionManagement::parse_path_with_sid(socket_path));
     auto socket = TRY(take_over_socket_from_system_server(parsed_path));
     m_fd = TRY(socket->release_fd());
 
diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index b89e34c48b..c156d14daa 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -13,6 +13,7 @@
 #include <AK/String.h>
 #include <AK/Vector.h>
 #include <LibCore/File.h>
+#include <LibCore/SessionManagement.h>
 #include <LibCore/System.h>
 #include <limits.h>
 #include <stdarg.h>
@@ -82,7 +83,7 @@ ErrorOr<void> pledge(StringView promises, StringView execpromises)
 
 ErrorOr<void> unveil(StringView path, StringView permissions)
 {
-    auto const parsed_path = Core::Account::parse_path_with_uid(path);
+    auto const parsed_path = TRY(Core::SessionManagement::parse_path_with_sid(path));
 
     Syscall::SC_unveil_params params {
         { parsed_path.characters(), parsed_path.length() },
diff --git a/Userland/Libraries/LibDesktop/Launcher.cpp b/Userland/Libraries/LibDesktop/Launcher.cpp
index 724e118e92..3f83b58112 100644
--- a/Userland/Libraries/LibDesktop/Launcher.cpp
+++ b/Userland/Libraries/LibDesktop/Launcher.cpp
@@ -36,7 +36,7 @@ auto Launcher::Details::from_details_str(String const& details_str) -> NonnullRe
 class ConnectionToLaunchServer final
     : public IPC::ConnectionToServer<LaunchClientEndpoint, LaunchServerEndpoint>
     , public LaunchClientEndpoint {
-    IPC_CLIENT_CONNECTION(ConnectionToLaunchServer, "/tmp/user/%uid/portal/launch"sv)
+    IPC_CLIENT_CONNECTION(ConnectionToLaunchServer, "/tmp/session/%sid/portal/launch"sv)
 private:
     ConnectionToLaunchServer(NonnullOwnPtr<Core::Stream::LocalSocket> socket)
         : IPC::ConnectionToServer<LaunchClientEndpoint, LaunchServerEndpoint>(*this, move(socket))
diff --git a/Userland/Libraries/LibFileSystemAccessClient/Client.h b/Userland/Libraries/LibFileSystemAccessClient/Client.h
index c62e51e453..8525c106f7 100644
--- a/Userland/Libraries/LibFileSystemAccessClient/Client.h
+++ b/Userland/Libraries/LibFileSystemAccessClient/Client.h
@@ -23,7 +23,7 @@ using Result = ErrorOr<NonnullRefPtr<Core::File>>;
 class Client final
     : public IPC::ConnectionToServer<FileSystemAccessClientEndpoint, FileSystemAccessServerEndpoint>
     , public FileSystemAccessClientEndpoint {
-    IPC_CLIENT_CONNECTION(Client, "/tmp/user/%uid/portal/filesystemaccess"sv)
+    IPC_CLIENT_CONNECTION(Client, "/tmp/session/%sid/portal/filesystemaccess"sv)
 
 public:
     Result try_request_file_read_only_approved(GUI::Window* parent_window, String const& path);
diff --git a/Userland/Libraries/LibGUI/Notification.cpp b/Userland/Libraries/LibGUI/Notification.cpp
index b022c9ac4b..adfbfb6189 100644
--- a/Userland/Libraries/LibGUI/Notification.cpp
+++ b/Userland/Libraries/LibGUI/Notification.cpp
@@ -15,7 +15,7 @@ namespace GUI {
 class ConnectionToNotificationServer final
     : public IPC::ConnectionToServer<NotificationClientEndpoint, NotificationServerEndpoint>
     , public NotificationClientEndpoint {
-    IPC_CLIENT_CONNECTION(ConnectionToNotificationServer, "/tmp/user/%uid/portal/notify"sv)
+    IPC_CLIENT_CONNECTION(ConnectionToNotificationServer, "/tmp/session/%sid/portal/notify"sv)
 
     friend class Notification;
 
diff --git a/Userland/Libraries/LibIPC/ConnectionToServer.h b/Userland/Libraries/LibIPC/ConnectionToServer.h
index 0b7ec8d54c..eecab12d86 100644
--- a/Userland/Libraries/LibIPC/ConnectionToServer.h
+++ b/Userland/Libraries/LibIPC/ConnectionToServer.h
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#include <LibCore/Account.h>
+#include <LibCore/SessionManagement.h>
 #include <LibCore/Stream.h>
 #include <LibIPC/Connection.h>
 
@@ -18,7 +18,7 @@ public:
     template<typename Klass = klass, class... Args>                                                    \
     static ErrorOr<NonnullRefPtr<klass>> try_create(Args&&... args)                                    \
     {                                                                                                  \
-        auto parsed_socket_path { Core::Account::parse_path_with_uid(socket_path) };                   \
+        auto parsed_socket_path = TRY(Core::SessionManagement::parse_path_with_sid(socket_path));      \
         auto socket = TRY(Core::Stream::LocalSocket::connect(move(parsed_socket_path)));               \
         /* We want to rate-limit our clients */                                                        \
         TRY(socket->set_blocking(true));                                                               \
diff --git a/Userland/Libraries/LibImageDecoderClient/Client.h b/Userland/Libraries/LibImageDecoderClient/Client.h
index 04f239a1b3..02fa7f8147 100644
--- a/Userland/Libraries/LibImageDecoderClient/Client.h
+++ b/Userland/Libraries/LibImageDecoderClient/Client.h
@@ -27,7 +27,7 @@ struct DecodedImage {
 class Client final
     : public IPC::ConnectionToServer<ImageDecoderClientEndpoint, ImageDecoderServerEndpoint>
     , public ImageDecoderClientEndpoint {
-    IPC_CLIENT_CONNECTION(Client, "/tmp/user/%uid/portal/image"sv);
+    IPC_CLIENT_CONNECTION(Client, "/tmp/session/%sid/portal/image"sv);
 
 public:
     Optional<DecodedImage> decode_image(ReadonlyBytes);
diff --git a/Userland/Libraries/LibProtocol/RequestClient.h b/Userland/Libraries/LibProtocol/RequestClient.h
index 3cc54cca10..cf8efe1856 100644
--- a/Userland/Libraries/LibProtocol/RequestClient.h
+++ b/Userland/Libraries/LibProtocol/RequestClient.h
@@ -20,7 +20,7 @@ class Request;
 class RequestClient final
     : public IPC::ConnectionToServer<RequestClientEndpoint, RequestServerEndpoint>
     , public RequestClientEndpoint {
-    IPC_CLIENT_CONNECTION(RequestClient, "/tmp/user/%uid/portal/request"sv)
+    IPC_CLIENT_CONNECTION(RequestClient, "/tmp/session/%sid/portal/request"sv)
 
 public:
     template<typename RequestHashMapTraits = Traits<String>>
diff --git a/Userland/Libraries/LibProtocol/WebSocketClient.h b/Userland/Libraries/LibProtocol/WebSocketClient.h
index 9edc484d38..db67203aa9 100644
--- a/Userland/Libraries/LibProtocol/WebSocketClient.h
+++ b/Userland/Libraries/LibProtocol/WebSocketClient.h
@@ -18,7 +18,7 @@ class WebSocket;
 class WebSocketClient final
     : public IPC::ConnectionToServer<WebSocketClientEndpoint, WebSocketServerEndpoint>
     , public WebSocketClientEndpoint {
-    IPC_CLIENT_CONNECTION(WebSocketClient, "/tmp/user/%uid/portal/websocket"sv)
+    IPC_CLIENT_CONNECTION(WebSocketClient, "/tmp/session/%sid/portal/websocket"sv)
 
 public:
     RefPtr<WebSocket> connect(const URL&, String const& origin = {}, Vector<String> const& protocols = {}, Vector<String> const& extensions = {}, HashMap<String, String> const& request_headers = {});
diff --git a/Userland/Libraries/LibSQL/SQLClient.h b/Userland/Libraries/LibSQL/SQLClient.h
index 0653ffa653..6248852ea5 100644
--- a/Userland/Libraries/LibSQL/SQLClient.h
+++ b/Userland/Libraries/LibSQL/SQLClient.h
@@ -16,7 +16,7 @@ namespace SQL {
 class SQLClient
     : public IPC::ConnectionToServer<SQLClientEndpoint, SQLServerEndpoint>
     , public SQLClientEndpoint {
-    IPC_CLIENT_CONNECTION(SQLClient, "/tmp/user/%uid/portal/sql"sv)
+    IPC_CLIENT_CONNECTION(SQLClient, "/tmp/session/%sid/portal/sql"sv)
     virtual ~SQLClient() = default;
 
     Function<void(int, String const&)> on_connected;
diff --git a/Userland/Libraries/LibWebView/WebContentClient.h b/Userland/Libraries/LibWebView/WebContentClient.h
index b305a75ed9..412584a68f 100644
--- a/Userland/Libraries/LibWebView/WebContentClient.h
+++ b/Userland/Libraries/LibWebView/WebContentClient.h
@@ -19,7 +19,7 @@ class OutOfProcessWebView;
 class WebContentClient final
     : public IPC::ConnectionToServer<WebContentClientEndpoint, WebContentServerEndpoint>
     , public WebContentClientEndpoint {
-    IPC_CLIENT_CONNECTION(WebContentClient, "/tmp/user/%uid/portal/webcontent"sv);
+    IPC_CLIENT_CONNECTION(WebContentClient, "/tmp/session/%sid/portal/webcontent"sv);
 
 public:
     Function<void()> on_web_content_process_crash;
diff --git a/Userland/Services/InspectorServer/main.cpp b/Userland/Services/InspectorServer/main.cpp
index 72e7c6ecb9..1cdaa5d552 100644
--- a/Userland/Services/InspectorServer/main.cpp
+++ b/Userland/Services/InspectorServer/main.cpp
@@ -17,12 +17,12 @@ ErrorOr<int> serenity_main(Main::Arguments)
 {
     Core::EventLoop event_loop;
 
-    TRY(Core::System::pledge("stdio unix accept"));
+    TRY(Core::System::pledge("stdio unix accept rpath proc"));
 
-    auto server = TRY(IPC::MultiServer<InspectorServer::ConnectionFromClient>::try_create("/tmp/user/%uid/portal/inspector"));
+    auto server = TRY(IPC::MultiServer<InspectorServer::ConnectionFromClient>::try_create("/tmp/session/%sid/portal/inspector"));
 
     auto inspectables_server = TRY(Core::LocalServer::try_create());
-    TRY(inspectables_server->take_over_from_system_server("/tmp/user/%uid/portal/inspectables"));
+    TRY(inspectables_server->take_over_from_system_server("/tmp/session/%sid/portal/inspectables"));
 
     inspectables_server->on_accept = [&](auto client_socket) {
         auto pid = client_socket->peer_pid().release_value_but_fixme_should_propagate_errors();
diff --git a/Userland/Services/LoginServer/main.cpp b/Userland/Services/LoginServer/main.cpp
index 192e1d0610..8ff9647ee9 100644
--- a/Userland/Services/LoginServer/main.cpp
+++ b/Userland/Services/LoginServer/main.cpp
@@ -6,6 +6,7 @@
 
 #include <LibCore/Account.h>
 #include <LibCore/ArgsParser.h>
+#include <LibCore/SessionManagement.h>
 #include <LibCore/System.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/MessageBox.h>
@@ -18,8 +19,14 @@
 
 static void child_process(Core::Account const& account)
 {
-    if (auto result = account.create_user_temporary_directory_if_needed(); result.is_error()) {
-        dbgln("Failed to create temporary directory for user {}: {}", account.username(), result.error());
+    pid_t rc = setsid();
+    if (rc == -1) {
+        dbgln("failed to setsid: {}", strerror(errno));
+        exit(1);
+    }
+    auto result = Core::SessionManagement::create_session_temporary_directory_if_needed(account.uid(), account.gid());
+    if (result.is_error()) {
+        dbgln("Failed to create temporary directory for session: {}", result.error());
         exit(1);
     }
 
@@ -29,11 +36,6 @@ static void child_process(Core::Account const& account)
     }
 
     setenv("HOME", account.home_directory().characters(), true);
-    pid_t rc = setsid();
-    if (rc == -1) {
-        dbgln("failed to setsid: {}", strerror(errno));
-        exit(1);
-    }
     dbgln("login with sid={}", rc);
 
     execlp("/bin/SystemServer", "SystemServer", "--user", nullptr);
@@ -68,6 +70,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::unveil("/etc/shadow", "r"));
     TRY(Core::System::unveil("/etc/group", "r"));
     TRY(Core::System::unveil("/bin/SystemServer", "x"));
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
diff --git a/Userland/Services/SystemServer/Service.cpp b/Userland/Services/SystemServer/Service.cpp
index 673f0683c5..f82e29428e 100644
--- a/Userland/Services/SystemServer/Service.cpp
+++ b/Userland/Services/SystemServer/Service.cpp
@@ -13,6 +13,7 @@
 #include <LibCore/ConfigFile.h>
 #include <LibCore/Directory.h>
 #include <LibCore/File.h>
+#include <LibCore/SessionManagement.h>
 #include <LibCore/SocketAddress.h>
 #include <LibCore/System.h>
 #include <fcntl.h>
@@ -322,17 +323,21 @@ Service::Service(Core::ConfigFile const& config, StringView name)
 
         // Need i here to iterate along with all other vectors.
         for (unsigned i = 0; i < socket_paths.size(); i++) {
-            auto const path = Core::Account::parse_path_with_uid(socket_paths.at(i), m_account.has_value() ? m_account.value().uid() : Optional<uid_t> {});
+            auto const path = Core::SessionManagement::parse_path_with_sid(socket_paths.at(i));
+            if (path.is_error()) {
+                // FIXME: better error handling for this case.
+                TODO();
+            }
 
             // Socket path (plus NUL) must fit into the structs sent to the Kernel.
-            VERIFY(path.length() < UNIX_PATH_MAX);
+            VERIFY(path.value().length() < UNIX_PATH_MAX);
 
             // This is done so that the last permission repeats for every other
             // socket. So you can define a single permission, and have it
             // be applied for every socket.
             mode_t permissions = strtol(socket_perms.at(min(socket_perms.size() - 1, (long unsigned)i)).characters(), nullptr, 8) & 0777;
 
-            m_sockets.empend(path, -1, permissions);
+            m_sockets.empend(path.value(), -1, permissions);
         }
     }
 
diff --git a/Userland/Services/WebContent/main.cpp b/Userland/Services/WebContent/main.cpp
index ea5c757617..9fdf9630a6 100644
--- a/Userland/Services/WebContent/main.cpp
+++ b/Userland/Services/WebContent/main.cpp
@@ -22,12 +22,13 @@
 ErrorOr<int> serenity_main(Main::Arguments)
 {
     Core::EventLoop event_loop;
-    TRY(Core::System::pledge("stdio recvfd sendfd accept unix rpath"));
+    TRY(Core::System::pledge("stdio recvfd sendfd accept unix rpath proc"));
+    TRY(Core::System::unveil("/proc/all", "r"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/etc/timezone", "r"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/request", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/image", "rw"));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/websocket", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/request", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/image", "rw"));
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/websocket", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     Web::Platform::EventLoopPlugin::install(*new Web::Platform::EventLoopPluginSerenity);
diff --git a/Userland/Utilities/aplay.cpp b/Userland/Utilities/aplay.cpp
index b8e1a9f537..2bf3f2f987 100644
--- a/Userland/Utilities/aplay.cpp
+++ b/Userland/Utilities/aplay.cpp
@@ -22,7 +22,7 @@ constexpr size_t LOAD_CHUNK_SIZE = 128 * KiB;
 
 ErrorOr<int> serenity_main(Main::Arguments arguments)
 {
-    TRY(Core::System::pledge("stdio rpath sendfd unix thread"));
+    TRY(Core::System::pledge("stdio rpath sendfd unix thread proc"));
 
     StringView path {};
     bool should_loop = false;
@@ -34,8 +34,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     args_parser.add_option(show_sample_progress, "Show playback progress in samples", "sample-progress", 's');
     args_parser.parse(arguments);
 
+    TRY(Core::System::unveil("/tmp/session/%sid/portal/audio", "rw"));
     TRY(Core::System::unveil(Core::File::absolute_path(path), "r"sv));
-    TRY(Core::System::unveil("/tmp/user/%uid/portal/audio", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));
 
     Core::EventLoop loop;