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On Windows, is it possible to get some sort of handle or details of a window displayed inside a RDP session?

Say you are logged on Machine A, then on there you open a RDP session connecting to Machine B. Is there some code I can run on A that will return the current active window on B?

I'm thinking of something equivalent to Win32.GetForegroundWindow(), but that will work "through RDP", so to speak, so it won't return a handle to the main RDP window, but to the active window inside that one.

To be honest, I don't really need a handle, I could probably do with just the window details (position, size etc).

Giacomo Lacava
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    RDP doesn't know either. It's just remoting the graphics operations. It's like trying to ask your LCD monitor for information about the foreground application. – Raymond Chen Mar 26 '12 at 20:46
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    In principle, it should be possible to write RDP plugins (or whatever they're called) to do this for you. But the appropriate code would need to be installed on both A and B. – Harry Johnston Mar 26 '12 at 23:11
  • Thanks @RaymondChen, I'm honoured! But I'm slightly puzzled: how does mstsc.exe implement its CTRL-SHIFT-PLUS/MINUS then ? Some undocumented extension to the protocol ? – Giacomo Lacava Mar 26 '12 at 23:11
  • @HarryJohnston I guess that's how Mstsc.exe is doing it then. – Giacomo Lacava Mar 26 '12 at 23:12
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    You may have noticed a program called rdpclip.exe running on the remote system. Guess what that guy does. – Raymond Chen Mar 27 '12 at 01:29
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    Oh wait, its even simpler. The client just sends an Alt+PrtSc to the remote machine and lets the remote machine take it from there. – Raymond Chen Mar 27 '12 at 03:44

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