Linux Planet Tutorial: Controlling Linux Remotely with X11

“X11 is perhaps most widely seen now as a graphical system for
Linux but rendering graphical user interfaces is not X Windows
primary talent. Where it shines and has some amazing facilities is
as a truly network aware environment for applications.”

“Its networking abilities are often breathtaking, particularly
on fast networks that can handle the graphics it uses. By adding
ssh secure use over wide area networks becomes possible. By using a
compressor like dxpc it is possible to use it over links with less
bandwidth Just remember: X11 is not really a system for graphics!
They are just a part of a complete system for allowing use of
distributed programs.”