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2.2.2 GUID typedefs

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GUID typedefs are used to create more meaningful names for existing types. The following GUID type synonyms are defined. 

 typedef GUID AUTH_SCHEME;
  
 typedef GUID CONVERSATION_ID;

AUTH_SCHEME: A GUID that contains the security mechanism's ID. 

CONVERSATION_ID: A GUID that contains the conversation ID used by the initiator and acceptor as the context handle to identify the exchange conversation. The initiator generates a random cryptographic-strength 16-byte value, stores it in the ConversationId field of the MESSAGE_HEADER structure, as specified in section 2.2.6.2. See section 3.1.5.2.