The best way is to set a screen saver to come on after a short amount of time, then use the setting "require password to resume from screensaver" - I think it's in the Security area of system prefs?



Also, you can program the screen saver to use a Hot corner as well - so, drag your mouse to the lower right corner, for example, and it will kick on the screen saver and you can walk away, knowing nobody gets on without unlocking. This is what I do each night before leaving work for the day, because I don't want to log-off in order to secure my desktop.

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