Gnutella

= an example of P2P Networks

URL = http://www.gnutella.com/

"used in many applications to allow connecting to the same network and searching files in a centralized manner. It's an open, decentralized search protocol for finding files through the peers. Gnutella is a pure P2P network, without any centralized servers.

Using the same search protocol, such as Gnutella, forms a compatible network for different applications. Anybody who implements the Gnutella protocol is able to search and locate files on that network. Here's how it works. At start up, Gnutella will try to find at least one node to connect to. After the connection, the client requests a list of working addresses and proceeds to connect to other nodes until it reaches a quota. When the client searches for files, it sends the request to each node it is connected to, which then forwards the request to the other nodes it is connected, until a number of "hops" occurs from the sender." (http://www.readwriteweb.com/archives/p2p_introduction_real_world_applications.php)