The OFF button turns off the ceiling mounted projector.  In a few rooms this button will switch OFF a monitor where a projector is not installed.

In some rooms the OFF button will activate and raise an electrically operated screen.

When the OFF button is pressed a cool down period begins.  

During the cool down period the projector fan will continue to run after the lamp has been turned off.

The OFF button will not switch off the local PC.  This needs to be done using shutdown options on the PC.

There is a slight variation in rooms in North Campus and James Hehir building.  In these rooms the ON and OFF functions are on one button.  Press once for ON and press again for OFF.  However, there is a complication with the previously mentioned warm up and cool down times.  If the button has been pressed to turn ON, the toggle to the OFF function will not work until after the warm up time.   Likewise if it has been pressed to turn OFF, the toggle to the ON function will not work until after the cool down time.