Communicating sequential processes
Communications of the ACM
Distributed processes: a concurrent programming concept
Communications of the ACM
A domain structure for distributed computer systems
SOSP '77 Proceedings of the sixth ACM symposium on Operating systems principles
The Cambridge Model Distributed System
ACM SIGOPS Operating Systems Review
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The paper describes how five minicomputers used in undergraduate teaching have been linked with, initially, a ring topology. An operating system kernel providing message primitives, already operational for a single site, has been extended for multisite connections and supports a hierarchy of processes according to the Reference Model for Open Systems Interconnection. In parallel, single-site systems based on procedural and rendezvous primitives are being formulated and extended for a distributed system. The aim of this work is to illustrate concepts and mechanisms in an educational environment.