e/RC 4000 Multiprogramming System

Information
has gloss	eng: The RC 4000 Multiprogramming System was an operating system developed for the RC 4000 minicomputer in 1969. It is historically notable for being the first attempt to break down an operating system into a group of interacting programs communicating via a message passing kernel. Although RC 4000 itself was not very successful it was nevertheless extremely influential, sparking the microkernel concept that dominated operating system research through the 1970s and 80s. The system is also known as Monitor and, somewhat confusingly, simply RC 4000 depending on the reference. For clarity, this article will use the term Monitor.
lexicalization	eng: RC 4000 Multiprogramming System
instance of	e/List of operating systems