Multiple Virtual Storage
     
         (MVS) Release 2 of OS/VS2, called MVS
        because it had multiple 16 MB virtual address spaces, in
        contrast to SVS.  MVS ran on the IBM 390 series
        mainframes.  It became MVS/SP, then MVS/XA (with 31-bit
        addressing) and then MVS/ESA.
     
        MVS/Open Edition (MVS/OE), aimed at the growing open systems
        market, added TCP/IP and Unix support in an MVS address
        space, allowing users to run IBM, CICS-type applications,
        batch applications and Unix.
     
        MVS/ESA was repackaged as OS/390 as a marketing exercise but
        it's basically the same thing.
     
        Version: 5.1.
     
        [Features?  Dates?]
     
        (1999-01-20)