hwndMenu (HWND)

      Menu-control window handle.

    usPrev (USHORT)

      Previous-menu indicator.

      TRUE

        Beginning of the menu has been reached
      FALSE
        End of the menu has been reached.

      hwndNewMenu (HWND)

        New menu window handle.

        NULLHANDLE

          No new menu
        Other
          New menu window handle.

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