Locking your screen prevents other people from accessing your computer while you are away from it. All of your applications and work remain open while the screen is locked, and the screensaver is displayed.
You can lock your screen in one of the following ways:
Press ->->.
Press Alt-Ctrl-L to lock the screen. This keyboard shortcut can be changed in System Settings under the Keyboard & Mouse icon. To access this go to ->-> then select the Keyboard & Mouse icon. Under Keyboard & Mouse select the Keyboard Shortcuts section, Global Shortcuts tab, and then locate the Lock Session under Desktop.
You can add a button to the Kicker for easy access. Right-click the Kicker, select and select the item, and then press the button.
To unlock the screen, move the mouse or press a key. Then, type your password and either press the Return key or press the button.
If more than one person has a user account on your computer and the screen is locked, other users can press the button to use the computer, even while the screen is locked. They will be unable to access your currently-open work, and you will be able to switch back to your locked session when they have finished using the computer.
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