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Leaving GNOME and X
If you want to leave your computer on but don’t want to leave it open to anyone just walking along, you can save yourself the time spent logging out of your GNOME desktop by using the screen lock. To do so, click the GNOME Menu button and choose Lock Screen; the screensaver is displayed. To return to productive life and your desktop, press any key or wiggle your mouse and enter your password in the X Screensaver window that opens.
Securing your computer while you step out for a moment
Locking your screen is one of the best security features you can use. To lock your screen, click the GNOME Menu button and choose Lock Screen. Your screen locks up and you must enter your password to get back in. Locking your screen is a good idea when you’re going to be away from it for even a minute or two.
Going home for the night
After you have finished for the day and want to go home (or just upstairs), you need to log out. Click the GNOME Menu button and choose Log Out. The Are You Sure You Want to Log Out? window opens. Click Log Out to — you guessed it — log out. You also have the options to shut down or reboot your computer.TipGNOME configures a random screensaver by default. You can select a single screensaver by clicking the GNOME Menu button and choosing PreferencesScreensaver. The Screensaver Preferences window opens. For example, you can switch from the default random screensaver to the Xjack (we all know that all work and no play makes Jack a dull boy) screensaver. It’s not a bad selection for those long winters spent at peaceful resorts with plenty of time to write Linux books!
eXterminating X
When you can’t get your applications to respond to you, you can simply stop X, which kills all programs running under it. To do so, press the Ctrl+Alt+Backspace keys all at one time. If you started X manually, you can then log out of the account. If X is started automatically at boot time (as we assume in this book), you see the X login screen and you can log back in.
