> Exit mechanism: Don't forget to implement and test an exit mechanism in your app. We locked our kiosks in a frame that disallowed hitting menu buttons. To es

> Exit mechanism: Don't forget to implement and test an exit mechanism in your app. We locked our kiosks in a frame that disallowed hitting menu buttons. To escape from the app without unlocking the frame, I implemented a "magic menu," consisting of three invisible buttons in the corners of the app. They would launch an admin menu if they were hit in the correct sequence within the correct amount of time.