OS Multiprocessing Interview Questions and Answers

What is Multiprogramming?

In multiprogramming, several programs run simultaneously on a single processor. Although in reality there is no real simultaneous execution of different programs, it gives a sense that they are executing simultaneously due to the part by part execution of all the programs.
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Multiprocessing Operating Systems
I need more explanation how does work several processes by the simple example
Sadije Melenica 10-31-2015