Changes the user group as a member of which the logged-on user has access to the application.
Calling this method is effective only if the logged-on user is declared as a member of multiple user groups. In this case, she accesses the application as a member of whichever of these user groups comes first alphabetically. Calling the method allows switching to other user groups. As a result, access rights on tables and columns, menu options, and items in the Objects List are changed accordingly.
The required usergroup is the name of the user group that the logged-on user switches to, as declared in USoft Authorizer.