Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. PLEX (Programming Language for EXchanges) is a special-purpose, pseudo-parallel and event-driven real-time programming language. Dedicated for AXE telephone exchanges, it was developed by Goran Hemdahl at Ericsson. Originally designed in the 1970s, it has been continuously evolving since then. The language has two variants: Plex-C used for the AXE Central Processor (CP) and Plex-M used for Extension Module Regional Processors (EMRP).

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