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Definition of X Window
X Window System core protocol - Wikipedia
Twitter's new X logo almost identical to Mac X11 logo
OpenVMS - Wikipedia
Stacking window manager - Wikiwand
Debian - X Window graphics subsystem
X Window System – Wikipédia
What are the different operations that you can perform with a mouse in a GUI-based operating system? - Quora
The Basic X Window System Architecture
44 What is the difference between the X Window System and the X