Should be one of the following:

• Disconnect - Disconnects from the current server.
• OpenBenchmarkDialog - Opens the "Video Hardware Stress Test" dialog.
• OpenChangeGameDialog - Does not work in GMod.
• OpenCreateMultiplayerGameDialog - Opens the Source dialog for creating a listen server.
• OpenCustomMapsDialog - Does nothing.
• OpenFriendsDialog - Does nothing.
• OpenGameMenu - Does not work in GMod.
• OpenLoadCommentaryDialog - Opens the "Developer Commentary" selection dialog. Useless in GMod.
• OpenLoadDemoDialog - Does nothing.
• OpenLoadGameDialog - Opens the Source "Load Game" dialog.
• OpenNewGameDialog - Opens the "New Game" dialog. Useless in GMod.
• OpenOptionsDialog - Opens the options dialog.
• OpenPlayerListDialog - Opens the "Mute Players" dialog that shows all players connected to the server and allows to mute them.
• OpenSaveGameDialog - Opens the Source "Save Game" dialog.
• OpenServerBrowser - Opens the legacy server browser.
• Quit - Quits the game without confirmation (unlike other Source games).
• QuitNoConfirm - Quits the game without confirmation (like other Source games).
• ResumeGame - Closes the menu and returns to the game.
• engine <concommand> - Runs a console command. Equivalent to RunConsoleCommand( <concommand> ).