Lock Your Computer Fastly: a Windows Trick

Leaving your computer in a hurry but you don’t want to log off?
You can double-click a shortcut on your desktop to quickly lock the keyboard and display without using CTRL+ALT+DEL or a screen saver.

To create a shortcut on your desktop to lock your computer:
Right-click the desktop.
Point to New, and then click Shortcut.
The Create Shortcut Wizard opens.
In the text box, type the following: rundll32.exe user32.dll,LockWorkStation
Click Next. Enter a name for the shortcut.
You can call it "Lock Workstation" or choose any name you like.
Click Finish.
You can also change the shortcut's icon (ie: the padlock icon in shell32.dll).

To change the icon:
Right click the shortcut and then select Properties.
Click the Shortcut tab, and then click the Change Icon button.
In the Look for icons in this file text box, type: Shell32.dll.
Click OK.
Select one of the icons from the list and then click OK
You could also give it a shortcut keystroke such CTRL+ALT+L.
This would save you only one keystroke from the normal command, but it could be more convenient.