Marlin Eller is an American programmer who was a manager and a software developer at Microsoft Corporation from 1982–1995, and he was development lead for the Graphics Device Interface of Windows 1.0 and also for Pen Windows.
Such software calculators first emerged in the 1980s as part of the Windows operating system, Windows 1.0.
Nathaniel Borenstein (who went on to develop the MIME standards) and his IT team at Carnegie Mellon University were also critical of Windows when it was first presented to them by a group of Microsoft representatives.
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The features of the operating system included a total lack of a command line interface (which was included in Microsoft's Windows 1.0 introduced in 1985), Finder, and the menu bar.