in good detail could anyone explain how to program a 1998 GA GT keyless entry remote?
please

welcome rustin , try this thread here , cover 97-04
http://www.automotiveforums.com/vbulletin/showthread.php?t=173306

whats ment by step #2 with the pin thing???

also if possible can i make my horn sound when using keyless entry?

Ya know rustin, I havnt the fogiest. Honestly I hav never had to do the (re)programing on a remote. But PM Flatrater, since he wrote the thread, he's the shizzle and so is several other Moderators around here. I'm sure they'll help you out if you ask.
But yes you can make the horn sound if you need be.