8 Mailer

 The Mailer, FD hereafter, is the core program of FrontDoor. It is
 responsible for sending and receiving messages; and optionally pass
 human callers to a BBS or other interactive software. The Terminal
 function is also located in FD and can be reached from one of its
 menus.

 Most functions of FD are reached by holding down the <Alt> key and
 pressing a key, <A..Z>.