Chasing Codes

Is there any software/hardware that allows you to do your own diagnostics (chase "service engine light" codes, for example)? If so, what are the details, and how easy is it to use? Thanks.

I think the new Predator handheld tuner can read codes and LS1 edit might get the code as well. I have no clue how they work though.

Come on. One of you knows something about this. Is LS1 Edit (or one of hte other programs/systems) the deal? I did not know if you could correct code errors with it, or just adjust a few settings. One of you electronic gurus, please advise.