OK/X button saves changes and closes programs

When you open an application or program on a touch screen device or access one of the configuration utilities, you'll see an "X" or "OK" in the upper right corner of the display. You can tap on this button with your stylus to exit the application/screen. If you have a phone-enabled touch screen device with a physical "OK" button, you can press that button to exit. This saves you the bother of pulling out your stylus, and combined with the D-pad, allows you to perform most common tasks on your device with one hand.