iis domain name server question

for those of you who know

how do you set up multiple domains on one computer

what I have done so far is this
set up an additional ip address on the machine in the advanced properties under tcp addresses.

I set up a web page on the machines iis then

then I set up the domain name
as domainexp the test for what I really want to do
which is to make a knowledge base appear when you type help in to the browser

I then set up a pointer for the domain name.

what would you prescribe.