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   ocr: 1.1 Windows sends a Windows message to a 2. Your subclassing code Visual Basic form. all the incoming intercepts messages and processes them. Custom window procedure Sub WndProc(...) If - uMsg = WM_MOVE Then Process the message. End If WndProc = callwindowProc (...) End Sub 4. Your custom window procedure returns a value The orginal window the the operating system. Visual procedure Basic (in runtime) to 3. Your code then calls the detault window procedure to correctly process all other form messages.