Early versions of the windows os used multitasking, in which programs can voluntarily give up cpu time to other processes.

Preemptive Multitasking

Explanation:

According to my research on information technology, I can say that based on the information provided within the question the term being mentioned is called Preemptive Multitasking. Like described in the question this is the act of taking control of the operating system from one task using the cpu time and giving the cpu time power to another task is called preempting.

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