It is a GTK+ front end for the efax program who can be used to send and receive faxes with a fax modem, and to view, print and manage faxes received. It also has a socket interface to provide a "virtual printer" for sending faxes from word processors and similar programs, and can automatically e-mail a received fax to a designated user, and automatically print a received fax. It is specially nice for a single user's use, as probably he/she doesn't usually need a fax server (i.e. hylafax). See /usr/doc/efax-gtk-3.0.17/README.SLACKWARE for configuration notes. Efax-gtk requires: libsigc++ (available on SlackBuilds.org)