The IsFirstInTransaction method is received by the server in an RPC_REQUEST packet. In response, the server MUST return the represented Message.FirstInTransaction.

 [propget] HRESULT IsFirstInTransaction(
   [out, retval] short* pisFirstInXact
 );

pisFirstInXact: A pointer to a short that specifies whether the message was the first sent by the transaction.

Return Values: The method MUST return S_OK (0x00000000) on success or an implementation-specific error HRESULT on failure.

When processing this call, the server MUST follow these guidelines:

• If the represented Message.FirstInTransaction is True:

  • Set the pisFirstInXact output parameter to 0x0001.

• Else:

  • Set the pisFirstInXact output parameter to 0x0000.