If you're not familiar with hamachi, you will want to download it for the beta 1 of Demigod if you want to play multiplayer.

https://secure.logmein.com/products/hamachi/vpn.asp?lang=en

The first beta will be LAN only with support for AI playres (so you can pay single player too effectively).  But we won't yet have true Internet play in unless you use Hamachi.