Couldn't tell you at the moment, but my suspicion is that he only means to have one aolserver running on his box, so having anything show up with ps is a bad sign.
Oh yeah, man ps from the command line should tell you whether its like Linux or Solaris, really its probably like FreeBSD.
One other thing, OS X has a handy GUI process monitor (like top). Its found under /Applications > Utilities. Can't remember the exact name, but it probably has the word process in it. You can sort by User. Check for nsadmin, root, etc. That should allow you to kill the offending process too.
Walter
