The W Window System is a graphical windowing system and precursor in name and concept to the modern X Window System.
W was originally developed at Stanford University by Paul Asente and Brian Reid for the V (operating system). In 1983, Paul Asente and Chris Kent ported the system to UNIX on the VS100, giving a copy to those working at MIT's Laboratory for Computer Science.
In 1984, Bob Scheifler of MIT replaced the synchronous protocol of W with an asynchronous alternative and named the result X.
Since this time the X Window System has gone through many fundamental changes and no longer bears any significant resemblance to W.
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|X Window System branch|
|W Window System|| Followed by|
X Window System