rc (ULONG) - returns

      Return code indicating success or type of failure:

      MMIO_SUCCESS

        If the function succeeds, 0 is returned.
      MMIOERR_CF_ENTRY_NOT_FOUND
        The element cannot be found.
      MMIOERR_INVALID_PARAMETER
        If any parameter is missing.
      ERROR_INVALID_PARAMETER
        If ulReserved is not zero.
      ERROR_BUFFER_OVERFLOW
        Element name is longer than ulElementLen.

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