This paper presents the results obtained in the project S-Net by members of the Compilation Technology and Computer Architecture (CTCA) group at University of Hertfordshire, U.K. We argue that globally distributed HPC will require tools for coordination of asynchronous networked components, and that such coordination can be achieved by reducing the vertex in- and out- degrees of the processing nodes to 1, using single-input single-output combinators for network construction and by externalising the component state. This approach is presented first as a set of language design principles and then in the form of coordination language. The language is illustrated by an application example.