hwnd (HWND) - input

      Handle of window that is being subclassed.

    pNewWindowProc (PFNWP) - input

      New window procedure.

      Window procedure used to subclass hwnd.

    pOldWindowProc (PFNWP) - returns

      Old window procedure.

      Previous window procedure belonging to hwnd.

      If this function fails, 0L is returned.

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