Transparent Flash Video

[color=black]:p: Hi everyone. I noticed on [color=#800080]Macromedia’s home page[/color] one of the rotating headers is a flash video of a woman walking through a virtual environment viewing different uses of flash video. (Vodaphone and [/color][color=black]Toyota[/color][color=black]) Her video layer has no background, allowing for the other layers to be visible. While a simple chromakey setup would work for shooting, the post-production and flash integration has me puzzled. How do they get her background transparent in flash? And, is this technique possible when using a streaming video called from a communication server or external progressive .flv called from http?[/color]

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[color=black]Thanks for the input.[/color]

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[color=black]Cheers [/color]