The DRS_MSG_UPDREFS_V1 structure defines a request message sent to the IDL_DRSUpdateRefs method.

 typedef struct {
   [ref] DSNAME* pNC;
   [ref] [string] char* pszDsaDest;
   UUID uuidDsaObjDest;
   ULONG ulOptions;

pNC: A pointer to the DSNAME of the root of an NC replica on the server.

pszDsaDest: The transport-specific NetworkAddress of a DC.

uuidDsaObjDest: The DSA GUID.

ulOptions: The DRS_OPTIONS that control the update.