^ Oh, does each separate internet connection have a different IP address? Or is it the computer that has the IP address? (I have a feeling this is a stupid question)
Not actually a stupid question! I had the same one when I was playing around with this.
Technically both a computer and the combination of a computer and a connection both have an IP. The IP address of a computer is basically meaningless as almost everything identifies a device by its MAC address.
The only thing TNT will see is the network IP which is the IP a that a network (wifi or ethernet) assigns your computer based on your MAC address.
So, long story short, yes each connection is a separate IP (you should check though because while some companies have different wifi connections, they all run through the same system and will assign the same exact IP to your device)
Woo, hope I answered your question somewhere in there.
Create, or buy, a shell and NEVER login on the same ip address, this means you can never check or even visit petpages without a proxy on this account. You basically want neopets to make no connection between your two account and if two account ever use the same IP it'll be a pretty glaring notice to TNT saying "Hey this is my main I'm halfheartedly acting like is not mine, ice me!".