Originally Posted by Doward
So the x.org server is a component of the X Window System?
Yes. It is the server program that provides the display/interfaces with
The X11 part is the protocol version (release 7), and usually refers to
the entire collection of applications, libraries, and the X server. Each
application and library may have its' own version, but is cross compatible
with all releases of X11r7.
The server version number (at least mine) is X.Org X Server 18.104.22.1681 (1.6.4 RC 1) and is just the display server application.