The Free On-line Dictionary of Computing (30 December 2018):

UnixWare

    Novell's implementation of Unix System
   5 heavily based on Release 4.2 but with enhancements and new
   bundled products.

   In 1993 Novell acquired Unix Systems Laboratories from
   AT&T along with the Unix trademark.  UnixWare was the result
   of Novell's efforts to make Unix interoperable with Novell
   NetWare.

   In 1995 Novell sold UnixWare and the rights to the Unix
   operating system to SCO at a time when UnixWare was gainnig
   popularity.  It was later the first 64-bit operating system on
   the Intel platform, and, in 1999, is the world's
   fastest-growing commercial operating system.

   [Any connection with X/Open?  URL?]

   (1999-11-10)