MS-DOS
There are several windows applications which are used to perform a wide variety of tasks. Let us see how to use MS-DOS, which is one of the most popular operating systems before the introduction of Windows. DOS consists of text based commands for various actions. Command Prompt can be used to enter the DOS commands.
To open the Command Prompt, click Start->All Programs->Accessories->Command Prompt
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A window as shown below appears on the screen.
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After the copyright information, it displays the home directory of the user who has logged in. Now, we can enter any DOS command.
Let us try the dir command to see a listing of the directory contents.

After you are done with, you can close the application by typing exit at the command prompt or by clicking on the close button.