hwnd (HWND) - input

      The window handle.

    fEnable (BOOL) - input

      Enable flag.

      TRUE

        The specified window wants to receive notifications every time its visible region is modified.
      FALSE
        The specified window no longer wants to receive any notification messages concerning its visible region.

      fSuccess (BOOL) - returns

        Success indicator.

        TRUE

          Successful completion
        FALSE
          Error occurred.

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