Using the case-study of a companion paper, the implementation of the language CYBA-L on a direct-shared-memory multimicroprocessor, CYBA-M, is described. A formal implementation approach based on the use of Petri-nets, which are executed directly, is used to produce a system which eliminates the need for message-passing primitives between processes, while still maintaining security of communication. A formal analysis of the behaviour of the system establishes its correctness