REXX (REstructured eXtended eXecutor) is an interpreted programming language which was developed at IBM. It is a structured high-level programming language which was designed to be both easy to learn and easy to read. Both proprietary and open source interpreters for REXX are available on a wide range of computing platforms, and compilers are available for IBM mainframes, such as III's T/Rexx.Rexx is widely used as a glue language, macro language, and is often used for processing data and text and generating reports; these similarities with Perl mean that Rexx works well in CGI programming and it is indeed used for this purpose. Rexx is also used as an internal macro language in some software including the ZOC terminal emulator. Additionally, the Rexx language can be used for scripting and macros in any programme which uses Windows Scripting Host ActiveX scripting engines languages (e.g. VBScript and JScript) if one of the Rexx engines (see below) are installed.

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