As emphasized above in the discussion of the Hosts menu, the client program can in principle run on any machine that has access to your X-term over the network. Various window managers are available. Our default window manager is olwm, the Open Look window manager, which is included with the Sun operating system distribution. The twm window manager is also availible if you prefer to use it. Perhaps the most important thing for you to know about X is that it is highly customizable.
Most applications come with a myriad of options.
Options can be specified either from the command line, or in another way that I'll discuss below. There are many colors and fonts to choose from. If you press the Select button in the Fonts window, you can then paste the name of the chosen font in another window by clicking the second mouse button. Usually, it is more convenient to specify options by default rather than in the command line. For this purpose, there are files .Xresources and .Xdefaults in your home directory.