Sub-Domain 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

There are commericial web-hosting softwares out there that do what you specified and a lot more. Check out plesk, ensim etc. Ofcourse, non of them are free, so if you are looking for a cheap solution, you'll have to dig deeper. Just google "web hosting software"

Good Luck!!

Hi Lightnin,
Thanks for the post.
Well..I have Helm Control Panel...& what they do is...use a special Active X object...& it's properties/methods etc.

I don't want this system to be manual.
I want something to happen automatically...Automation is my objective.

Even if I get to know which files are to be updated...the type of entires that needs to be done...& the location of such files...I can write a snippet to do the work.
But...honestly speaking..I am not very clear of these details (as to what entires are to be written...& on what files...& the syntax).

So...I guess I am still in dark.

Nevertheless...I do appreciate your sincere help.
Thanks!
Regards
WC