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XPL0 is a high-level programming language designed for use in embedded systems and real-time applications. It was created by John Walker and began as an evolution of Forth. XPL0 combines elements of structured programming with the ability to directly manipulate hardware — making it suitable for low-resource environments like microcontrollers. The language provides extensive support for multitasking, allowing it to handle multiple threads with ease. XPL0 is not as widely used as other languages today but still serves in certain niches where direct control over hardware and minimal resources are important design considerations.

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