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Multiple processors executing process simultaneously to achieve a better performance cane be termed as concurrent processing. But MS-DOS does not provide such processing.

Three major complications of concurrent processing:

1. Operating system has to keep the track of main memory address space allocated to each process so that a process does not affect or harm other processes data.

2. Time overhead is another complication which his caused while switching from one process to another process. Time overhead is required to store the current register values and loading the register values of the next process from its Program Control Block (PCB).

3. Another requirement of Time overload is when a running process requires a large space in memory then other process needs to be dumped back to hard disk.

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Q: Ms dos provides no means of concurrent processing. justify it?
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