IsUserMemberOfGroup(GroupName, [UserName])

This method checks whether a user belongs to a certain user group or not. The GroupName parameter indicates the name of a user group to check and the UserName parameter indicates the name of a user to check. If this parameter is omitted or is equal to an empty String, this method considers the user returned by the E3GetActor method. This method returns True if the user belongs to the user group indicated by the GroupName parameter or False otherwise.