How can I control (read/write) the offscreen surface of another prog?

For some testing and experimenting, I need to know, how to get to an offscreen surface of another application?

Or primary, or back buffer, the process probably the same...
I work in DirectX/Win32, VC++/ASM, so just tell me the basic idea...

/I don't want to re-invent the wheel/, and I know it's possible, since the screen-grabber programs can do it.

THX to all Geniuses out there,
(System/Game programmer)
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