In all of the preceding scenarios, the "Windows logo key+L" shortcut can lock the computer. If you do not have a password that is set for your user account, anyone can unlock your computer. To set a password for your user account: In Control Panel, double-click User accounts, select your user account, and then click Create a password.
You can also use the following keyboard shortcuts with a Microsoft Natural Keyboard or any other compatible keyboard that includes the Windows logo key and the Application key.
Press To
Windows logo key Display or hide the Start menu
Windows logo key+L Lock the computer
Windows logo key+BREAK Display the System Properties dialog box
Windows logo key+D Show the desktop
Windows logo key+M Minimize all windows
Windows logo key+SHIFT+M Restore minimized windows
Windows logo key+E Open My Computer
Windows logo key+F Search for a file or folder
CTRL+Windows logo key+F Search for computers
Windows logo key+F1 Display Windows Help
Windows logo key+R Open the Run dialog box
Windows logo key+U Open Utility Manager
Application key Display the Shortcut menu for the selected item
