2.2.2.1 Transaction Context Property

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To indicate to the server that the client is running within a transaction, the client MUST include a transaction context property as part of the client context in an object activation request.

The policyId field of the PROPMARSHALHEADER instance ([MS-DCOM] section 2.2.20.1) for the transaction context property MUST be set to guidTransactionProperty, as specified in section 1.9. The CLSID field of the PROPMARSHALHEADER instance ([MS-DCOM] section 2.2.20.1) for the transaction context property MUST be set to GUID_NULL. The transaction context property MUST be marshaled using the OBJREF_CUSTOM format ([MS-DCOM] section 2.2.18.6), and the CLSID field of the OBJREF_CUSTOM instance MUST be set to CLSID_TransactionUnmarshal, as specified in section 1.9.

The format of the OBJREF_CUSTOM.pObjectData buffer for CLSID_TransactionUnmarshal MUST be specified as follows.