Is there any p2p programs that has built-in http-tunneling?

I was at a friend's house with my sis laptop. I was connecting to my friend PC to use his aol broadband connection.

then I find out all these bearshare, limeware, kazaa don't work behind a PC. you have to be the main pc. And my friend stubbornly wouldn't install anything and all he uses is bittorrent.