Dialup modems speak the protocol, or at least they used to, so it was possible to send or receive a fax without a physical copy of the document. Just by "printi

Dialup modems speak the protocol, or at least they used to, so it was possible to send or receive a fax without a physical copy of the document. Just by "printing" from word to the modem and entering a phone number. I remember writing an excel macro to iterate over a list of customers and send a personalized word document to them. (This was 20 years ago I think and not all of our customers had an email)