Well Steve, in fact this is how aliasses work. You may have more than one e-mail address (I have about 12 of them). There is no e-mail box at that address, but e-mails to that address are always forwarded to an e-mail address that you have defined. You can always change that forward-to address.
This is extremely convenient. I have just one mailbox, situated at my provider. That address is not known, as I don't distribute it. The address that I give to others is an automatic-forward address. The trick is that when I change from provider, I dont have to change my e-mail address. Otherwise you have to send an address change notice to everybody.
I have learnt this from Joker.com. Suppose that "anderson.com" was a free URL. Then
you might register the URL "anderson.com" there. That would cost you say $ 10,- per year. There is no web space in that amount, but you can define twenty e-mail forward addresses for it. Then you would have an e-mail address: steve(at)anderson.com, although you keep your current provider for the reception and the sending of your mails. And an e-mail address for your wife, and one for each of your children and so on, as long as they are named "Anderson".
The same happens with the nbtv.org addresses. And with the website
http://www.nbtv.org. The real website is situated at a provider "wyenet.com", but you are accessing it as nbtv.org. This is called URL forwarding, a kind of automatic link.