In both academia and industry, peer-to-peer (P2P) applications have attracted great attention. Peer-to-peer file sharing applications, such as Napster, Gnutella, Kazaa, BitTorrent, Skype and PPLive, have witnessed tremendous success among end users. And the uses of peer-to-peer network for multimedia streaming, conferencing, gaming, file backup, information retrieval is on the rise. Recent statistics suggests that P2P traffic accounts for as much as 70% of Internet traffic. Unlike a client-server based system, peers bring with them serving capacity. Therefore, as the demand of a peer-to-peer system grows, the capacity of the network grows, too. This enables a peer-to-peer multimedia application to be cheap to build and superb in scalability. The purpose of the tutorial is to examine issues associated with the successful building and deployment of a P2P multimedia application. The technologies discussed can be applied to P2P file sharing, P2P conference, P2P media streaming, P2P VoIP, ...