Bumping Old Discussion

I found Peter’s pressure project utilizing an Arduino to be an interesting idea. Using the microcontroler as a means for creating unusual interfaces is a fantastic idea. He mentions that the hardware caused things to change “on screen”, which is particularly fascinating. I assume that the Arduino was providing input to some other application that processed the audio/video aspect of the project. I’m curious if in addition to what was described, can the Arduino also receive information from the A/V application while also serving as an input device? For example, could touching the fruit controllers also cause lights or motors to activate based on instructions form the computer controlling everything?