If they ever change hosts they can modify their account completely without your intervention. Unix, Windows NT Virtual Hosting is the simple, handy, and easy to install domain redirection script. Virtual Hosting allows webmasters to have any amount of domain names per one IP account. This script even allows you to offer subdomains as a free automated service. No SSI required.
Script is easy to install and runs without intervention.
Unix Allows webmasters to have more than one domain name per IP address. Will also allow webmasters to have sub-domains of their domain name. Unix Domain Director lets you redirect domains that share the same IP address to different pages or directories. Account editor allows users to change their information. A Product of Matt's Script Archive, Inc.