OpenGL/D3D: How do I get a screen grab of a game running full screen in Windows?

Question

Suppose I have an OpenGL game running full screen (Left 4 Dead 2). I\'d like to programmatically get a screen grab of it and then write it to a video file.

I\'ve tr

Answer 1

I found a sourceforge'd project called taksi:

http://taksi.sourceforge.net/

Taksi does not provide audio capture, though.