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PLEX (Programming Language for EXchanges) is a specialized computer language used in the telecommunications industry to model telephone exchange functions. The language is part of the Bell Labs' Signal Computing System (SCS), which helps manage the development of software for telecommunications. PLEX provides constructs specifically designed to facilitate programming within a real-time environment and supports both synchronous and asynchronous execution models, which are necessary for handling telecommunication transactions while ensuring data consistency and reliability.