3.17.4.1.45 SenderId (Opnum 51)
The SenderId method is received by the server in an RPC_REQUEST packet. In response, the server MUST return the represented Message.SenderIdentifier.
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[propget] HRESULT SenderId( [out, retval] VARIANT* pvarSenderId );
pvarSenderId: A pointer to a VARIANT that contains a byte array (VT_ARRAY | VT_UI1) that contains the sending user's identifier.
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:
Set the pvarSenderId output parameter to the value of the represented Message.SenderIdentifier.