The name derives from the research group at Newcastle University, under Brian Randell, which developed it.
If the example machine is named "unix1", an overall UNIX United scheme with an additional second machine, "unix2", would look like: If we wish to copy file a from "unix1" to "unix2" to sit alongside files b and c, example equivalent commands might be: It required no changes to the UNIX kernel.
Rather, it ran in user-space, using a modified version of the C standard library of its day which was capable of recognising these new semantics.
The original implementation at Newcastle was for UNIX V7 on a set of PDP-11 computers connected by a Cambridge Ring network.
[3] Subsequent implementations added support for other versions of UNIX (including BSD 4.2 and System V), network technologies, protocols and hardware architecture (VAX, Motorola 68000).