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1.8 Vendor-Extensible Fields

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The methods defined in the Print System Remote Protocol specify either the DWORD or HRESULT data type for return values. DWORD return values are Win32 error codes specified in [MS-ERREF] section 2.2. Implementers reuse those values with their indicated meanings. Choosing any other value runs the risk of collisions.

HRESULT method return values are defined in [MS-ERREF] section 2.1. Vendors can define their own HRESULT values, provided they set the C bit (0x20000000) for each vendor-defined value, indicating the value is a customer code.

Print server implementations MUST generate GUIDs, as defined in [MS-DTYP] sections 2.3.4, 2.3.4.2, and 2.3.4.3, strings for the purpose of identifying specific printers. The 128-bit value encoded by the GUID string SHOULD conform to the specification in [RFC4122] section 4.