This function has been deprecated in USoft 10.0:
It has been replaced by:
In versions previous to USoft 10.0, if the logged-on user was declared as a member of multiple user groups. She accessed the application as a member of whichever of these user groups came first alphabetically. Calling the method allowed switching to other user groups.
In USoft 10.0, the call syntax RulesEngine.SetUserGroup() has become a synonym of RulesEngine.SetRole().