External command in DOS are
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1) Which two of the following DOS commands are used to display or set the date and time of your computer's infernal clock?
2) Match the device driver HIMEM.SYS to its operation
3) After upgrading your computer to a new DOS version, an older application displays the error message "Incorrect DOS version". What should you do to run this application?
4) Which command is used to delete the directory and all of its contents in one step?
5) We need system files to run