Rep: i think there a few rc. files that are run at startup... all at slightly different times. rc.S is a big one I think, but it is run very early on. rc.5 or rc.4 are good as well if you want it run later (as they are run when entering runlevels 4 and 5 respectively). and he is about all I know! sorry I can not be of more help, but lots of them are run on boot so experiment =)