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   ocr: 1, Windows sends a message to a Windows 2 Your. subdassing code Visual Basici form. all the incoming intercepts messages and processes them. Custom window procedure Sub WndProc(...) lf uMsg : NM_HUVE Then - Process the message. End If WndProc = alTHIndOMPTOC (...) End Sub 4. Your custom window procedure returns a value The orginal window the to the operabng system. Visual procedure Basicruntime) (in 3 Your code then cals the default window procedure to correcty process al other form messages.