air conditioning pump as on board air

i've heard of it being done but cant seem to find a write up on it as i dont have a clue how to acheive this. i would also want know if the air cond. is useless after turning it into on board air or how greatly it affects it. anybody done this very interested in the turnout?

http://jeep.off-road.com/jeep/article/articleDetail.jsp?id=257802


I didnt read this one thru but maybe it'll help.

obviously you cannot continue to use your a/c compressor for a/c AND air compressing...
you might want to search for ''OBA''.... great mod...

i did mine, evaperator had a hole in it and i didnt fell like pulling the dash to fix it, so my AC was junk anyways. great mod! BUT if my AC still worked with no prob. i would have just went with a aftermarket set up