2.2.8.1.1.5 TXUSER_BEGINNER_MTAG_BEGUN

The TXUSER_BEGINNER_MTAG_BEGUN message indicates that the request to begin a transaction was successful.  

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MsgHeader (24 bytes)
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guidTx (16 bytes)
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MsgHeader (24 bytes): This field MUST contain a MESSAGE_PACKET structure:

• The dwUserMsgType field MUST be 0x00001012.

• The dwcbVarLenData field MUST be 16.

guidTx (16 bytes): This field MUST contain a GUID that specifies the transaction identifier. The value MUST NOT be set to a NULL GUID.