From: "Andrew Harvey" <pbook at bagheera dot id dot au>

> The key is the gateway. DHCP gives the user the gateway to use and such. I 
> don't know if there are any which emulate Mac OS X's Location feature for 
> windows, because that may be helpful. I have a setup for my static IP at 
> home, DHCP for school, and another static IP for work, as well as the 
> "Automatic" DHCP setting for other places.

In XP, under TCP/IP properties, if you are set for DHCP, you have an 
"Alternate configuration" tab allowing you to set a static IP if DHCP is not 
found.  However, that doesn't help this guy...