Handbook:Understanding Your Server:Introduction
For a thorough understanding of the HylaFAX server there is no alternative to reading the man pages. Especially useful are hylafax-server(5F), faxgetty(8C), hfaxd(8C), faxq(8C), faxrcvd(8C), hylafax-log(5F), hosts.hfaxd(5F), and although technically a client application, faxstat(1) is useful in determining the status of the HylaFAX server.