In the next generation Internet, the network should not only be considered as a communication medium but also as a large source of services which use entails performance, reliability and security gains. In this context, the end-to-end hypothesis promoting all the network complexity at its periphery should evolve towards a "peerto-peer hypothesis" promoting the integration of application layer services inside the network. Following a networking by component paradigm, Internet scale distributed services, performing tasks resulting from composition of elementary services, are conducted to communicate using arbitrarily complex communication schemes. This paper introduces a new generation of transport protocol, which extends the traditional notion of transport connection for supporting, at the transport layer, communication patterns that go beyond traditional point-to-point or point-to-multipoint communication schemes.