Mac OS: Lock screen with keyboard shortcut

When I step away from my Mac at work, I want a quick way to lock the screen, and hitting a hot-corner with the mouse is problematic for me. This hint details how to lock the screen from the keyboard by using Automator to build a Service in Snow Leopard.

First, check the General tab on the Security System Preferences panel to ensure that the Require password [some period] after sleep or screen saver begins box is checked.

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