Possible Duplicate:
Equivalent of Win-L on Mac
What's the Mac equivalent of Windows' Win + L command for locking the screen?
Possible Duplicate:
Equivalent of Win-L on Mac
What's the Mac equivalent of Windows' Win + L command for locking the screen?
http://osxdaily.com/2007/04/23/ask-os-x-daily-how-do-i-lock-a-mac-os-x-workstation/
Okay, one solution: (1) System Preferences -> Desktop & Screen Saver: set up a sleep corner for your screen saver (2) System Preferences -> Security: enable immediate password protection for your screen saver
Why step #2 isn't referenced from step #1 is beyond me.