An operating system allows the user to access the hardware in an easy-to-use manner. It accepts commands from the keyboard and displays them to the monitor. The two most popular operating systems are DOS and Microsoft Windows. The Disk Operating System, or DOS, gained its name from its original purpose of providing a controller for the computer to access its disk drives. The language of DOS consists of a set of commands which are entered directly by the user and interpreted to perform file management tasks, program execution and system configuration. DOS is a non multi-tasking operating system in that it can only run one program at a time, whereas Windows 95 and NT are multi-tasking.
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