rc (ULONG) - returns

Return codes.
• Success

  ERROR_DEVICE_IN_USE(99)

  Port name is already defined.
  ERROR_FILE_NOT_FOUND(2)
  Port driver name is not valid.
  ERROR_INVALID_LEVEL(124)
  ulVersion is not 0 or 1.
  ERROR_INVALID_PARAMETER(87)
  An invalid buffer was given.
  ERROR_NOT_ENOUGH_MEMORY(8)
  Not enough memory to satisfy request.
  ERROR_NOT_SUPPORTED(50)
  pszComputerName is not supported, or the port driver does not support the virtual port.
  PMERR_SPL_SPOOLER_NOT_INSTALLED(0x4009)
  Spooler not enabled; virtual ports require spooler to be enabled.

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