A/UX is Apple Computer's implementation of the Unix
operating system for some of their Macintosh computers, the
latest versions running on the Mac II, Quadra and Centris
series of machines.
The system is based on System V.2.2 with features of V.3 and V.4 and
BSD 4.2 and 4.3. It is POSIX and System V Interface Definition[?]
(SVID) compliant.
A/UX has the Macintosh operating system
Mac OS version 7.0.1 running on top of it, so the user
is virtually using a normal Macintosh, with the familiar
Finder graphical user interface and
applications. An X Window System server application or a terminal
program may be used to interface with the underlying Unix-system.
Alternatively the user may choose to run a full X11R4 session, without
the Finder.