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operating system : FOLDOC | operating system (OS) The low-level software which handles the interface to peripheral hardware, schedules {tasks}, allocates storage, and presents a default interface to the user when no application program is running. The OS may be split into a kernel which is always present and various system programs which use facilities provided by the kernel to perform higher-level {house-keeping} tasks, often acting as servers in a client-server relationship. Some would include a graphical user interface and window system as part of the OS, others would not. The {operating system loader}, BIOS, or other firmware required at {boot time} or when installing the operating system would generally not be considered part of the operating system, though this distinction is unclear in the case of a {rommable operating system} such as RISC OS. The facilities an operating system provides and its general design philosophy exert
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