Phillips 208 has a cart with a MacBook, a DVD/VHS player, and an InFocus JTouch touchscreen monitor.
Touch input functionality should work automatically. If the touchscreen isn’t responding, check that the USB cable is plugged into the three-way adapter. Without it, the touch input won’t be received by the computer. Note that the touchscreen functionality doesn’t recognize separate displays–it will always behave as if they’re mirrored.
Find Calibrate in the UPDD menu: 
 It will only work while connected via USB.
To change the input for any other equipment, press the Input button on the underside of the monitor frame on the far right.