Disclosed is a method for controlling access to a chat room using a peer-to-peer (“P2P”) network. The method includes the steps of sending a search request to a first set of nodes in the P2P network, the first set of nodes neighboring a node requesting the search and including at least one node;...http://www.google.fr/patents/US7675874?utm_source=gb-gplus-shareBrevet US7675874 - Peer-to-peer instant messaging and chat system
