To load a given font, use XLoadFont().
To return information about an available font, use XQueryFont().
To perform a XLoadFont() and XQueryFont() in a single operation, use XLoadQueryFont().
To unload the font and free the storage used by the font structure that was allocated by XQueryFont() or XLoadQueryFont(), use XFreeFont().
To return a given font property, use XGetFontProperty().
To unload a font that was loaded by XLoadFont(), use XUnloadFont().