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REXX (Restructured Extended Executor) is a high-level programming language designed for ease of use and cross-platform compatibility. It was created by Mike Cowlishaw at IBM in the late 1970s as an easier-to-use alternative to JCL for managing mainframe jobs. REXX features simple syntax, with instructions separated by new lines or semicolons, and block structures defined by indentation. The language is extensible through libraries that can be dynamically linked at runtime, allowing it to interact with other languages such as C. REXX has evolved over the years and has been implemented on a variety of platforms including mainframes, servers, desktops, and embedded systems.