Lock Screen In MBP

I need to know how to lock my screen on my MBP. I want to do it kind of the same way you do in windows. ctrlAlt+DelEnter. how do I do this on the Mac?
Thank you,
Jason.

Open the "Security" control panel.
1. Click on "Disable automatic login"
2. Click on "Require password to wake this computer from sleep or screen saver".
Now, you can either
1. Log out of your account (ShiftoptionQ)
(note: this method quits out of all open applications)
or
2. Designate a "hot spot" for your screen saver to kick-in in your "Dashboard & Expose" control panel.

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