A multitasking operating system?

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What are the characteristics of a multitasking operating system?
What makes it multitasking?
Are there non-multitasking operating systems?

Best Solution

What are the characteristics of a multitasking operating system? What makes it multitasking?

Multitasking operating systems allow more than one program to run at a time. They can support either preemptive multitasking, where the OS doles out time to applications (virtually all modern OSes) or cooperative multitasking, where the OS waits for the program to give back control (Windows 3.x, Mac OS 9 and earlier).

Are there non-multitasking operating systems?

Any OS that only allows one thing to be done at a time (DOS for instance).