When a new 0/S (RSX-11) came along that allowed multiple simultaneous users of the same PDP 11 computer, SQUEEZE users became a problem, as using it meant all users had to stop working while it ran.
The RSX-11's fragmentation approach was carried over into the Open VMS 0/S and, when its principal designers moved over to Microsoft, they built the NT file on systems this same fragmentation model.
Xerox has also signed an agreement with Advanced Computer Communications of Santa Barbara, California for communications software products enabling the Xerox 8018 information systems and 1100 scientific information processor family to operate with Digital Equipment's VAX and PDP-11-based systems which use the VMS,
RSX-11 and Unix operating systems.