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CMS-2, or Common Mainframe System 2, is a programming language used to develop software for avionics systems. It was developed in the 1960s and became popular in the aerospace industry due to its reliability and determinism. CMS-2 supports structured programming concepts, such as modules and functions, which can be designed with built-in error detection features. The language closely integrates with the MIL-STD-1750A computer architectures often present in military aircraft systems. Despite being an older technology, it is still used for maintaining legacy avionic platforms where safety-critical applications are required to operate effectively throughout their service life.