I am not sure that I understood your query completely.
Here is my advice: Whenever you make a call to risk related method like evaluate risk, it calls UDS operation using Webservice methodology.
i.e. Use Risk Auth Sample Application ( OOTB application provided by the product) and perform evaluate risk
you will see following message in "$ARCOT_HOME\logs\arcotriskfort.log"
Thu May 31 02:44:14.495 2018 INFO: pid 8004 tid 10640: 2: 1:27002: UDS Log : Successfully retrieved the user [SKTESTUSER01] for organization [LDAPTESTORG]
Also check for the following message in "$ARCOT_HOME\logs\arcotuds.log"
2018-05-31 02:44:14,420 PDT : [http-nio-18080-exec-13] : INFO : usermgmt.ws.ArcotUserRegistrySvcSkeleton : [null] : [null] : User SKTESTUSER01 (Organization: LDAPTESTORG) retrieved successfully. UDS transactionId: 1e7908aa-d96e-493e-bf91-676d580ed767
Negative Test:
If you stop the UDS service and perform the same operation, you will notice a UNKNOWNUSER rule influence the risk advice.