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First, using PostMessage with HWND_BROADCAST should be done no more often than once per app. I presume that is what you are doing here: finding the other program. Typically what you send via this message is the HWND of a window it is to communicate with, and it sends you, via that window, another registered message that tells you ITS window handle, and now all you need to do is window-to-window     

Group: microsoft.public.vc.mfc · Group Profile · Search for Messagesa in microsoft.public.vc.mfc
Author: Joseph M. Newcomer
Date: Dec 21, 2007 19:55

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Group: 3dfx.game.discussion · Group Profile · Search for Messagesa in 3dfx.game.discussion
Author: didiergalant
Date: Feb 14, 2007 12:27

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