The operating
system controls computer system resources and coordinates the flow of data to
end from the micro processor. At the same time it also controls the flow of
data between input and output devices such as keyboard & monitor.
Multiprogramming
operating system allows more than one program to run concurrently. In a given
moment, only one task is actually being executed but within a larger time span
of several minutes, the computer is processing several programs by alternating
between actual executions. When one job needs to do I/O, another can resume. So
two or more independent programs are executed in the same time span by inter
leaving their execution.
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