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I have a window, and I am looking at the messages that are being sent to it using Spy++. Is it possible to determine which process sent my window a given message, if it indeed was sent from another process?

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up vote 7 down vote accepted

No, Win32 window messages do not contain information about where they were sent from (unless that information is specifically included as part of the message WPARAM and/or LPARAM components).

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