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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.
OpenVMS, often referred to as just VMS, is a multi-user, multiprocessing virtual memory-based operating system designed to support time-sharing, batch processing, transaction processing and workstation applications.