The DRS_MSG_ADDSIDREQ union defines the request messages that are sent to the IDL_DRSAddSidHistory method. Only one version, identified by dwInVersion = 1, is currently defined.

 typedef 
 [switch_type(DWORD)] 
 union {
   [case(1)] 
     DRS_MSG_ADDSIDREQ_V1 V1;
 } DRS_MSG_ADDSIDREQ;

V1: Version 1 request.