I am buying a new truck awaiting the dealer to get all the papers together.He calls me today and asks if I have a "corpcode". I told him I never heard of that,so,obviously,I do not have one. I haveto go to motor vehicles and pick up an application tomorrow. For those who have one,what's it for,why do you need one,and are there any downfalls in having one? I assume its another way to dip into our pockets.