Dynamic DNS Basics
http://www.webmonkey.com/03/11/index2a.html

Adams, Paul
Webmonkey
2003

Abstract:

A machine on a DSL or cable line without a static IP is connected to the Internet, but only one way. People from the outside can't initiate communication with that machine except through an intermediary, because they simply can't find it! This makes hosting from home impossible ... except through trickery. For there is a solution, a clever one. It is called dynamic DNS.