i think that the chips physically connect to your computer and then your dash mounted monitor inside the cab.
my truck has a diablo chip embeded in the pcm. you physically have to open the pcm and install it. this allows for more options and features to come alive that a tuner alone cannot access.
freaking awesome. when i get to drive it. hell i work all the freaking time and dont want my truck at work so i drive the expedition or focus to work
haha the thing that frustrates me though, is that I have read about people who say they upgraded their edge to a gryphon. wtf.