ZDNet: X Can Still Mark The SpotJul 20, 1999, 20:41 (10 Talkback[s])
(Other stories by Steven J. Vaughan-Nichols)
Thanks to dmitchell for this link.
"Every question you ever had about X Windows finally answered."
"The X window system has been the foundation for Unix graphical user interfaces (GUIs) and Unix-based apps for years on every platform under the sun. Yet X is often misunderstood and confusing, and it doesn't have to be.
"The next time customers or channel partners confront you with questions about X Windows, pull out this article for a handy Q&A on the topic."