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# Operating Systems and Their Applications An operating system (OS) is system software that manages computer hardware and software resources and provides an interface between the user and the computer. Operating systems can be classified according to the number of users they support, the number of tasks they perform simultaneously, and the speed with which they respond to events. Single-user, multitasking, multiuser, and real-time operating systems differ mainly in their purpose, resource management, and application areas. A single-user operating system is designed primarily for one user at a time. It provides basic facilities for running programs, managing files, controlling _____ ___ ________ ______ ___ ___.
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