Operating environment
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In computing, an operating environment is the environment in which users run application software, whether by a command-line interface (such as in MS-DOS or the Unix shell) or a graphical user interface (such as in the Macintosh operating system or a web browser).
An operating environment is usually not a full operating system but is a form of middleware that rests between the OS and the application. For example, the first version of Microsoft Windows, Windows 1.0, was not a full operating system, but a GUI laid over DOS albeit with an API of its own. Similarly, the IBM U2 system operates on both Unix/Linux and Windows NT.
Some operating environments for programming purposes are referred as programming environment; e.g., "UNIX programming environment" for shell in unix.
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