Source : Free On-Line Dictionary of Computing

Netware Input/Output Subsystem
     
         (NIOS) The lowest {layer} in
        the {Novell NetWare} {client} architecture.  NIOS is the
        interface layer between the client operating system and the
        32-bit client services provided by NetWare.
     
       
     {(http://developer.novell.com/research/appnotes/1996/november/01/04.htm)}.
     
        (1999-04-24)