Have you had a chance to read
the documentation yet? It will help explain quite a few things...
A graphic example of the server modes that bpvik mentions are found
here. And information on configuring the server can be
found here. Information on the web-based administration from anywhere on your network (or the internet if you have it configured that way) can be found
here.I have never tried to use XP internet connection sharing and SME as I use an SME server in server/gateway mode, but it should be pretty straight forward... I would guess that you will have to give your servers addresses of 192.168.0.xxx as I think that ICS sets up your gateway address to be 192.168.0.1.
You will probably also have to make sure that your router is using something other than 192.168.0.xxx addresses...
Ryan