heey Needy !!
why do you seem to be so worried on your system being hacked ?
if you do a hacking and get someone's (i call him 'owner' here) network connection .. it's obvious that the owner has your ip address and bandwidth information on the router.
needless to say owner has full access to your system if he is an advanced computer user. so if you think you are safe, you might be mistaken !!
So STOP using freebies network from others and get your own stuff installed. .... Got it !!