D
At the root level of the rooms, you can check off, or on, all of the rooms. In otherwords, when you see the list of rooms, before you twirl it open, that box can also be clicked. I do this if I go from one class to the next. I have a large class, I turn them all on with the one click, and turn off the ones that aren't being used. If it is a small class, I turn them all off. Actually, I made classrooms for the small classes. The only challenge is that I move students around pretty often, so I am frequently have to go turn on one computer from the large classes. I wish there was an easier way.
