Controlling Linux Remotely With X11 - page 5
X Windows maybe an old system, but it has some amazing and flexible features. In particular, 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.