rc (USHORT) - returns

      Return codes indicating success or type of failure:

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIOERR_UNBUFFERED
        Tried to disable a buffer that was already disabled.
      MMIOERR_INVALID_HANDLE
        The handle passed was not correct.
      MMIOERR_INVALID_PARAMETER
        An incorrect parameter was passed.

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