Alpha channel in after effects

Hi all, i hope you can help me.
What i would like to do is to use a black and white .mov file as alpha channel for another .mov file.
Exactly as in photoshop is possible to do with two images.
Someone can indicate me some easy example or say me if my approach is wrong?
For some reason, I tried to replicate so many tutorials about it, without found exactly what i was searching to do, and without success.
Thank you so much!

http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c1103906c6dea-7cf9 a.html
Mylenium

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