Not sure what you are saying. If you connected both computers to the same
fax line, you cannot send a fax from one to the other without some unusual
actions. If you connected one computer's fax/modem line directly to another
without any phone company connection, the same would be true. A few of the
older fax programs that ran on really old versions of windows would allow
you to bring up a terminal emulator on both pc's, manually enter the
appropriate modem commands (Hardware modems only) and then switch the modems
to fax mode. Some of the really old modems would work in this manner
without "battery" which is supplied by the phone company when a connection
is made or a phone line has a phone "off hook". Since an off hook generates
a dial tone, the dial tone must be cleared by making a call to another phone
line. Some phone companies allow users to dial a "ringback" number. When the
resulting phone ringing is answered, the phone companies equipment simulates
a line connected to another phone. This establishes the basic conditions
necessary to get two hardware modems to connect if they are sent the
appropriate commands via a terminal emulator. If the terminal emulator is
part of a fax program, and things work properly, the fax programs will then
go into fax mode. Usually the manual modem commands determined which was the
originator and receiver.
