Users of the TOS have to be trained in the respective part of the TOS dependent on their responsibility. In a first level users have to understand where to find which functionality and which information has to be entered where.
In a second level the user -especially the control staff and planning teams- the users may learn how the system reacts on their entries and which parameter configuration fits best to the current situation on the terminal.
Especially this second level may be supported by Virtual Terminal functioning as a test-bed for the control system TOS. Users may improve their abilities by "playing around" in the virtual world without influencing the real terminal processes at all.