How would I go about having a final screen where I want to direct them to go get the experimenter. I want to the reaction time to be calculated as soon as the screen appears. In case they try pushing some random keys, I want the only key to be able to move on to be F10 - which will be pushed by the experimenter. I don't want the screen to be shown for more than 10 minutes. Is it possible to do all of this?