I am sure it is more complicated than simply getting a nigrogen filled tank and putting an air hose on it to your gun.
But the link that I have proved may have a little more to help understand it. I was at work when I found that and didn't have time to read it all. But the once over I gave it sounds like it is a pretty promising way to decrease a number of problems related to applying automotive finishes.
Now with the waterborne that is comeing our way...........
Brian