Multiprogrammed, batched systems provide an environment where various system resources were used effectively, but it did not provide for user interaction with computer systems. Time-sharing is a logical extension of multiprogramming. The CPU performs many tasks by switches that are so frequent that the user can interact with each program while it is running. A time-shared operating system allows multiple users to share computers simultaneously. With each action or order at a time the shared system becomes smaller, so only a little CPU time is r...