I asked Falko this question but I'll also post it here for other who might have the same set up.
I'm using the Suse 10.3 setup as documented here.
I have a number of Front Page web sites on another machine behind my firewall as follows:
xyx.com at IP 192.168.1.60
abc.com at IP 192.168.1.61 ---> and so on.
This machine has an IP of 192.168.1.90
How do things get set up so the Suse/ISPconfig will serve up these web pages.