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  2. VM (operating system) - Wikipedia

    en.wikipedia.org/wiki/VM_(operating_system)

    The default login screen on VM/370 Release 6. VM (often: VM/CMS ) is a family of IBM virtual machine operating systems used on IBM mainframes System/370 , System/390 , zSeries , System z and compatible systems, including the Hercules emulator for personal computers.

  3. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    An operating system (OS) is system software that manages computer hardware, 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, printing, and other resources.