[mikester]

If you're using Windows XP you can restrict their accounts so that they cannot adjust the network settings. Without those abilities they can't connect to 'rogue' access-points. Then I would try to find out who owned it and discuss the ramifications of it with them. Technically you could call the police and have them talk to them about providing porn to children. I realize that may be considered a bit over the top; but still. Kids generally speaking should not have access to internet porn. Leaving your playboys about is probably okay though.