Once you have hit the button which allows you to swap what you normally see to the display screen and visa versa, HOW DO YOU SWITCH IT BACK? You can't click on it, because your computer is now in play mode and you can't use your touchpad. I clicked the button out of curiosity (I know curiosity killed the cat.) and now I can't get it back into the normal display. I am forced to use mirror image just to be able to use Keynote to make a presentation.