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 for OS/390
From The Free On-line Dictionary of Computing (30 December 2018) :

      An IBM mainframe operating system,
     featuring integrated MVS, UNIX, LAN, distributed
     computing and application enablement services through its
     base elements.  These base services enable open, distributed
     processing and offer a foundation for object-ready application
     development.  The OS/390 base includes a Communication
     Server that includes VTAM, the VTAM AnyNet feature,
     TCP/IP+and+TIOC.++It+provides+SNA+({3270">TCP/IP and TIOC.  It provides SNA ({3270), APPC,
     High Performance Routing, ATM support, sockets and
     OS/390 is basically rebranded, repackaged MVS/OE, CMOS
     processors, RAMAC disk arrays and open systems extension
     to networking in VTAM, the principle being that if you can't
     compete, rebrand what you have and tell everyone it's
     something new.">(

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