Xfs is a daemon that listens on a network port and serves x fonts to x servers (and thus to x clients). all x servers have the ability to serve locally installed fonts for themselves, but xfs makes it possible to offload that job from the x server, and/or have a central repository of fonts on a networked machine running xfs so that all the machines running x servers on a network do not require their own set of fonts. xfs may also be invoked by users to, for instance, make available x fonts in user accounts that are not available to the x server or to an already running system xfs.