The DRS_MSG_QUERYSITESREQ union defines the request message versions sent to the IDL_DRSQuerySitesByCost method. Only one version, identified by dwInVersion = 1, is currently defined.

 typedef 
 [switch_type(DWORD)] 
 union {
   [case(1)] 
     DRS_MSG_QUERYSITESREQ_V1 V1;
 } DRS_MSG_QUERYSITESREQ;

V1: The version 1 request.