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DOS

As a software engineer at Novell, I mastered MS-DOS, DR-DOS, and other flavors of the Disk Operating System and used them daily. This command-line interface OS ruled before Windows added a stable graphical interface in Windows 3.11 and later. I know all DOS internal and external commands, environment variables, and other aspects of this pioneering operating system. I can program Int 21's and other advanced programming aspects of DOS.