Why we introduce the concept of 'process' ? (28.218.81608.81609.81613.222.81848.81868.81869)

A 'process' is the unit of work in a modern time-sharing system. Only one program is permitted to be executed at a time before. Multiple programs can be loaded into memory and executed concurrently now. The former one had complete control of the system and had access to all the system's resources. The later one requires stronger control and more compartmentalization of various programs. All these needs contributed to the item 'process'.

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