While working with MS-DOS which key is used to get the p[revious command used:

While working with MS-DOS which key is used to get the p[revious command used:

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1) HIMEM.SYS controls:

2) Filename extensions help identify certain files. What filename extension identifies executable files?

3) In which year the first operating system was developed

4) An entire path name, consisting of several sub-directory names can contain upto

5) Which command is used to copy all files from drive A with extension .TXT to the currently logged drive and directory?