NO knowledge of how Jazz works is required. All you need to do is be a savvy hacker of games. This can be done through a two methods, Packets (information sent between JJ2 network nodes) or Memory (the Modification of the program itself(either at runtime or before runtime)).
GOOD RESOUSOURCES WOULD BE: http://www.gamehacking.com especially: http://gamehacking.com/sites/articles.php

And remember ALL programmers are HACKERS, BUT, not all HACKERS are programmers.

You don't need to hack anything if you code a new software from scratch...

Speaking of useful programs you can't have...

[IMG]http://unknown.halleyscometsoftware.com/zomg/guesswhat.JPG[/IMG]

Speaking of useful programs you can't have. But UF can have them, I saw him with a fast fast fire and an unlimited fire shield. Aww, I forgot that you didn't want me to talk about your programs. :7

What is so useful in JA, I wonder.

It's called coding them yourself

Not that I have JA or anything, but it doesn't give you unlimited shields...

JA is the worst trainer ever

No, not really... I wish I could make drop down-menus :(
Oh, and I still don't have JA or any other trainers.