What Is X11?
The X Window System is a networking windowing system that provides a base set of communications protocols and functions for building graphical interface clients for computers with bitmapped displays. You should never refer to the X Window System as X Windows; the proper terms of reference are X, X11, X Version 11, or the X Window System, version 11.
X was first developed at the Massachusetts Institute of Technology in the early 1980s. The first commercial release of X was X10 in the mid-80s, with the first X11R1 release in 1987. Though the original MIT consortium has since disbanded, and X now falls under ownership of non-profit X.Org, a consortium whose executive membership includes Compaq, Hewlett Packard, Hummingbird, IBM, SGI, ...
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