So I attend my local community college, I use their network with my laptop, and other macs show up on the network under "shared". For most all there is is a "dropbox" folder on their local drive (or something) others actually have file sharing enabled and I can go through their stuff (not that I do). Anyway I check system pref> sharing and I don't have anything checked for sharing but I read on the cornell website its possible to set up a built in firewall. I don't have that on my 10.5. Is that a 10.6 feature? is a free firewall install anywhere? Do I have to worry? even if others can't go through my files the possibility of them being able to load stuff on my computer (if thats what that "dropbox" thing was) kinda scary? Am I over (or under!) thinking this???