Here is how you can Create a Shortcut to Lock Your Computer.
1. Right-click the desktop. Point to New, and then click Shortcut.
2. The Create Shortcut Wizard opens.
3.In the text box, type the following: rundll32.exe user32.dll,LockWorkStation Click Next.
4.Enter a name for the shortcut.
5.Click Finish.
You can also change the shortcut's icon. To change the icon:
1.Right click the shortcut and then select Properties.
2. Click the Shortcut tab, and then click the Change Icon button.
4.In the Look for icons in this file text box, type: Shell32.dll. Click OK.
5.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.