How to lock and unlock the computer by using windows 7 prof?

I need to show that I can lock (& of course unlock) my computer. It's a safety thing.

How can I do this?  On the Welcome screen, it shows something to do with it, but afraid to click on it, as I don't know how to unlock later.

Need help please.  Same thing for a computer running XP.

Please see the answer to your other question here

Tags: Windows

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