When upgrading from V2.0 to V2.5, must I change my client program?
If I upgrade to V2.5 from V2.0, will I have to change anything in my Client Application?
No, there is nothing to change. It is true that the OPC ProgID has been changed from DSSI.OmniServer.2 to SWToolbox.OmniServer, but the old ProgID will still work with V2.5. So there is no need to change anything on the client application.