In which year the first operating system was developed
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1) Which of the following applies to external DOS commands?
2) What you type at the DOS command prompt to return back to windows?
3) Which command is used to delete the directory that is empty?
4) When you create a subdirectory within a directory, the process is known as _____
5) While working with MS-DOS, which command is used to switch to the monochrome display from color display?