How to render out with an alpha channel

I want to render out a QuickTime animation so I can layer it over some video in Final Cut Pro. How do I get an Alpha channel in the video. Have tried the Animation Codec but that doesn't do it. Which codec should I use?
Kevin

For more information, see these sections of After Effects Help on the Web:
"About alpha channels and mattes"
"Alpha channel interpretation: premultiplied or straight"
"Output module settings"

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