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I asked the question "Will Rebol 3 extension support any windows api call including those requiring callback ?".

Now to be sure and to take an example, will it possible to use Win 32 SetWindowsHookEx() and do screen capture like this:

http://www.codeproject.com/KB/cpp/Screen_Capture_Win32.aspx

Rebol is really missing screen capture function.

+1  A: 

Carl has released a new hostkit that support callbacks.

see http://www.rebol.net/r3blogs/0329.html

Graham Chiu