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An operating system ( OS) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and ...
NATO was established on 4 April 1949 by the signing of the North Atlantic Treaty (Washington Treaty). The 12 founding members of the alliance were Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States. [126] Four new members joined during the Cold War: Greece ...