so my brother got a new laptop with the built in wifi and it picks up other ppls wireless routers i guess. he can use at least 3 other ppls for connecting to the internet. i guess they didnt establish any passwords or protections. so my question is, can the ppl he hook up to view his computer or what he is looking on the internet? would there be any security issues for him? he could save 50 a month by borrowing someones connection..