Most well designed X clients will support your choice of fonts or document which fonts are required. Program documentation should also explain what fonts are being used by the clients.
If you need to find the name of a font manually, you can use xfontsel, the font display program that comes with most X windows software.
Run xfontsel on the host computer, and use the menus to change fonts until you find the font you are interested in. Locate that font on your host computer, and then transfer the file to your Macintosh. You can then move that font to your Macintosh and install the it under the MacX Font Director.
For more information on MacX and fonts, consult Chapter 5 of the "Apple MacX" manual or see the "MacX Users Guide."
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