This paper addresses the problem of establishing collaboration between devices in a home environment, even when no previous knowledge is known or stored on the devices. It focuses on two basic questions: how a collaboration is established between devices and how it is described. A true collaboration needs semantic information about the services a device offers and how these services can be combined. After discussing current technologies for this aim, we propose a network of embedded processes in home appliances. These processes are modelled with a process algebra called CSP (Communicating Sequential Process) and represented with an ontology. Finally, the authors describe the advantages of this new approach and briefly suggest possible future work in this topic. KEYWORDS pervasive, ontology, semantics, CSP.