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The Keil RTX is a royalty-free, deterministic Real-Time Operating System designed for ARM and Cortex-M devices. It allows you to create programs that simultaneously perform multiple functions and helps to create applications which are better structured and more easily maintained.

RTX is a line of real-time operating system (RTOS) extensions by the firm IntervalZero. They are a software extension or abstraction layer that converts Microsoft Windows operating system into a RTOS. It was the first Windows real-time solution on the market.