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Emerald is an object-oriented programming language designed for building distributed systems and applications. The language was created in the 1980s as part of the Emerald Project at the University of Washington, intended to support complex interactions among many independently executing objects. Emerald includes built-in mechanisms for distribution, fault-tolerance, and heterogeneity at a language level rather than relying on libraries or frameworks. It uses asynchronous message passing for communication between its distributed objects. Though not widely used in commercial applications due to its high-level design meant mainly for research purposes, Emerald has contributed concepts to distributed computing and influenced later languages such as Java and C#.

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