The OVERVIEW display shows up to 36 GROUPS. Each group represents up to eight instruments. Each instrument can be a controller, indicator, or switch. If a controller is in manual an "M" will appear in the appropriate slot on the datum line. If there is a deviation from setpoint a small vertical bar will appear. The scale for deviations from setpoint is +20% (above datum) to -20% (below datum). "Clicking" with either mouse button in the general area of a group will call up that particular group display. Group displays may also be selected any time by entering the Group Page Number.