To end your session, close all your currently active processes, then perform one of the following actions:
Choose Actions -> Log Out.
Open the GNOME Menu, then choose Log Out.
Click on the Log Out button.
Before you end a session, you might want to save your current settings
so that you can restore the session later. During the logout process, a dialog
asks if you want to save your current settings. In the Sessions
preference tool, you can select an option to automatically
save your current settings.