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It was originally going to be called "Interface Manager", was not a complete operating system, but rather an "operating environment" that extended MS-DOS.
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First popular version of Windows - First version to support multi-tasking using virtual memory
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Introduced a tottaly new Graphical User Interface - Same as today's in its majority. Applications run without needing to use the DOS system.
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Many Versions depending on need of use - Added version for professionals. Support for Portable Computers included
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Used on many smartphones and mobile devices - A competitor to Apple's IPhone(IOS) and Google's Android(Linux)