Source : Free On-Line Dictionary of Computing

Network Operating System
     
         (NOS) The {operating system} on {Control
        Data Corporation}'s {Cyber Computer}.
     
        [Details?]
     
        (2002-11-22)

network operating system
     
         (NOS) An {operating system}
        which includes {software} to communicate with other computers
        via a {network}.  This allows resources such as files,
        {application programs}, and {printers} to be shared between
        computers.
     
        Examples are {Berkeley Software Distribution} {Unix},
        {Novell}, {LAntastic}, {MS LAN Manager}.
     
        [Is there a specific OS called "Network Operating System"?]
     
        (2001-03-13)