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Multiuser DOS(1) A multiuser DOS-compatible operating system from Caldera that supports multiple terminals from a single PC (386 and up). It is distributed mainly through VARs that have modified it for their own purposes. Multiuser DOS evolved out of Concurrent DOS from Digital Research, which was acquired by Novell and later sold to Caldera (SCO Group).
(2) (multiuser DOS - generic) A DOS-compatible operating system that supports multiple terminals from a single PC.