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Over 20 billion dollars year are spent on computer products an services. It is estimated that 70 per cent of that amount goes into software development, maintenance, data processing salaries, and other software-related activities. Every indications is that the applications and availability of computers will continue to expand. What controls the computer and acts as immediately between the user and the comuter? It is the operating system. The operating system is a program that, when executed, controls the operation of the computer. For example, the operating system performs the task of scheduling the use of the computer. Sophisticated operating systes increase the efficiency and consequently decrease the cost of using a computer. For example, the operating system may provide for simultaneous operation by allowing one user's program to execute while the printout of an earlier user is being completed... PLEASE SEND UR ME OPITIONS AND DETAILS ABOUT THE COMPUTER SO THAT WE SHARE THE KNOWLEDGE....