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 for multi-user
From The Free On-line Dictionary of Computing (30 December 2018) :

      A term describing an operating system or
     application program that can be used by several people
     concurrently; opposite of single-user.  Unix is an example
     of a multi-user operating system, whereas most (but not all)
     versions of Microsoft Windows are intended to support only
     one user at a time.
     A multi-user system, by definition, supports concurrent
     processing of multiple tasks (once known as "{time-sharing}")
     or true parallel processing if it has multiple CPUs.
     While batch processing systems often ran jobs for serveral
     users concurrently, the term "multi-user" typically implies
     interactive access.
     Before Ethernet networks were commonplace, multi-user
     systems were accessed from a terminal (e.g. a vt100)
     connected via a serial line (typically RS-232).  This
     arrangement was eventually superseded by networked personal
     computers, perhaps sharing files on a file server.  With
     the wide-spread availability of Internet connections, the idea
     of sharing centralised resources is becoming trendy again with
     cloud computing and managed applications, though this time
     it is the overhead of administering the system that is being
     shared rather than the cost of the hardware.
     In gaming, both on PCs and games consoles, the equivalent
     term is multi-player, though the first multi-player games
     (e.g. ADVENT) were on multi-user computers.

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