Extending the maximum number of GUI sessions

What parameter is used to extend the maximum number of GUI sessions in a 4.6C environment? The parameter is "rdisp/max_alt_modes" and its default value is 6 sessions. The minimum is 2 and the maximum is 16. Use transaction RZ11 to get additional information about the parameters and use RZ10 to implement the parameters. Also, you might want to look into these other parameters: login/multi_login_users login/disable_multi_gui_login