Sub Domain & TLD Mapping

Hi,
I am looking for some serious guidance...can anyone please help me?

My requirement stands like this:
I have a dedicated server.
I want my members to reach our site & register. On registering, I want to offer them a sub-domain instantly (based on their userid).
(say, Mr. ABCD goes to www .mysite .com & after registration gets a site called abcd .mysite .com).

So, how do I do it on the fly?

Again,
Once this sub-domain is configured...say abcd .mysite .com.
What do I need to do in order to map a Top Level Domain (TLD) like www .abcd .com to abcd .mysite .com?

What do I need to do all these on the fly (I mean...an automated process).

I have a Windows2003 server with own DNS server.
So, script wise I will be running ASP (or .NET if required). However, the server supports PHP as well.
I am running IIS 6.0.

Can you please guide me to apossible solution?
Thanks in advance.
Please help!!!

Regards
WC

 

 

 

 

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