How to lock the screen in OS X?

im new to Mac. been a PC user for over 10 yrs. I'm just wondering if OSx has a similar shortcut to lock the screen just like what you can do with "windows key+L" in XP.
I know i can do that with screen savers or just log off. But i just wanna know if there is an easier way. Thanks.

What about using the Sleep command?
APPLE > SLEEP
It puts your display and computer asleep. You can set it so that it requires you to insert your password to awake the computer from sleep mode or even your screen saver for that matter.
Open System Preferences then go to Security section. Then find the check box that says "Require Password to wake this computer from Sleep". Check it.
There's also an application that locks it and sets an alarm off when it is touched, tracked pad moved, keyboard or taking out your power adapter. It's called iAlertU. iAlerU - Version Tracker. You use your remote.
Open it in your applications folder. It's then added to your menu bar. Hold down the Menu button for 2 seconds on your apple remote until you hear a car lock sound. Do the same to unlock it.
Remember to mark as helpful or solved.
-benny

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