Reserved Categories have a desktop-specific meaning that has not been standardized (yet). Desktop entry files that use a reserved category MUST also include an appropriate OnlyShowIn= entry to restrict themselves to those environments that properly support the reserved category as used.
The table below describes Reserved Categories.
| Reserved Category | Description | 
|---|---|
| Screensaver | A screen saver (launching this desktop entry should activate the screen saver) | 
| TrayIcon | An application that is primarily an icon for the "system tray" or "notification area" (apps that open a normal window and just happen to have a tray icon as well should not list this category) | 
| Applet | An applet that will run inside a panel or another such application, likely desktop specific | 
| Shell | A shell (an actual specific shell such as bashortcsh, not a TerminalEmulator) |