CST is a programming language based on Smalltalk-80 that supports concurrency using lock, asynchronous messages, and distributed objects. Distributed objects have their state distributed across many nodes of a machine, but are referred to by a single name. Distributed objects are capable of processing many messages simultaneously and can be used to efficiently connect together large collections of objects. They can be used to construct a number of useful abstractions for concurrency. This paper describes the CST language, gives examples of its use, and discusses an initial implementation. Keywords: Programming languages. (kt)
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