Abstract. MoCha is an exogenous coordination middleware for distributed communication based on mobile channels. Channels allow anonymous, and point-to-point communication among nodes, while mobility ensures that the structure of their connections can change over time in arbitrary ways. MoCha is implemented in the Java language using the Remote Method Invocation package (RMI) [15]. In this paper we promote the use of mobile channels for P2P applications and show the benefits of the MoCha middleware.