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Concurrent C is a superset of C and a tool for distributed processing that provides parallel programming facilities. A uniprocessor version of Concurrent C was implemented and subsequently extended to run on 2 types of multiple processor systems: 1. a distributed system that consists of a set of computers connected by a local area network, and 2. a tightly coupled, shared memory multiprocessor. The Ethernet UNIX environment was not optimized for the short messages that characterize concurrent C processes, and the high multiprocessor communication cost reduces the number of applications that can effectively use Concurrent C. The shared memory multiprocessor is a better architecture for Concurrent C because interprocessor transaction calls are faster, and porting of the uniprocessor implementation and debugging are simplified.