1.   More fax users make for a snowball effect, he says.

2.   Fax-on-demand, a kind of online service for fax users, is another reason for the rapid growth of home fax machines.

3.   The problem for Sprint is that the new program could end up being highly attractive to cyberspace denizens and fax users.

4.   Thermal fax paper is mostly used in lower priced fax machines, owned mainly by small businesses and home fax machine users.