MS-DOS version 4.xx

In 1988, the operating system with graphical display started mushrooming. Microsoft also released Windows version 1.0 on Windows 1985 and version 2.0 in 1989. At the DOS version 4.0, Microsoft created a shell program with a DOS Shell, which has an interface like DOS Executive's Windows version 1.0. At that time, there is a shell which is also a popular program that runs on the DOS operating system, with a Norton Commander (NC) made by Peter Norton. By using the shell, users can more easily organize and archive files, and run the program, in one screen only. In addition, because the mouse can simplify the operation of computers, DOS Shell could also support it.

Version 4.0 is the latest version many changes. The next version is improved versions only, and various additional utilities.

Source :http://id.wikipedia.org/wiki/MS-DOS#MS-DOS_versi_4.xx

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