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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.
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.