Right after the launch, - the system login dialog appears on the screen. It contains three fields in GUI and CHUI/AS types of interface, and two fields in CHUI. User enters his user id (login)and password (password) into the first two fields. The third field is need for reservation server's IP address. It usually has some value after installation of the system, but this value may be changed when it's necessary.
After successful user registration main system menu is showing on the screen. It means that all procedures of connection and authentification are passed with success. Main menu is different in GUI and CHUI variations of system. Menu consists from menu items , where common actions are made and submenu, which also consists of menu items and other submenus. So we can speak of menu hierarchy or menu tree. Use ``Enter'' and ``F4/Esc'' or mouse (in GUI) for the navigation through this tree.