Indeed, there are no sequential processes unless they are programmed explicitly in terms of messages.
Computation is invoked by the presence of a collection of messages at the same location.
We have embodied MDC in two languages, extensions of Icon and of C. MDC is designed to be coherent with the global structure of multicomputers and hence forms a basis for general purpose multicomputing. Here we introduce the features of Message Driven Computation and relate them to the features of multicomputers, to Actors, to other parallel programming systems, and to our goals. It should be understood from the outset that our current version of MDC is nearly at the assembly language level. It is not much easier to use than any other low level language. We base the design of MDC on the structure of multicomputers.