You can also connect a laptop on to the front of the Honeywell EGPWC and simulate a flight through it.
Demo I saw was the using a real time playback of the FDR parameters from the AA 757 that crashed at Cali. The first soft "Caution. Terrain." was generated 1min 20sec before the first "Whoop! Whoop! Pull up!".
Fantastic piece of kit.