When the keypad or the touch panel (GUI) has been untouched for a given period of time you can activate certain function or sequences.
The timer can be set and you can add more events to your need.
So imagine having a room where you set the timer to 6 hours and add a press button function, which then presses your power off button. You have then created a system that turns off automatically, a green solution so to say. Many schools, where the vacations are long you will save the schools projector lamp budget quite a lot in the long run.