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Each running thread is allocated a time slice. When a thread's allocated time slice expires, the CPU state is saved and the next thread's state is restored. Thus each thread continues from exactly where it left off. The time slices themselves are just a few milliseconds in length. In this way many applications can appear to be running simultaneously. However, the more applications that are running, the slower they will execute because they each get fewer time slices per second. Applications are also prioritised so that high priority tasks get more CPU time than low priority tasks. Typically there are around 16 levels of priority, where 0 is the highest priority.

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