Maybe you've probably seen website addresses in this format: http://www2.anydomain.com
What??!! Is there another World Wide Web - a hidden side to the more familiar "www"?
Thankfully, not! If you can set up "sub-domains" in your web space, you can create your very own "World Wide Web v.2.0" (Not the same as the "Web 2.0" buzz word). "www2" is just a "sub-domain". And you could set up "www3", "www4", and as many "World Wide Webs" as you want. Power, eh!
Let me explain a little about sub-domains..
A "sub-domain" is a subsidiary name for an existing fully-fledged and registered domain.
The correct web address for a sub-domain is:
http://subdomain.mydomain.com
Notice there's no "www" bit. And, unlike "normal" web addresses, you can't leave out the "http://" bit when you type a sub-domain address into your web browser.
If you leave out the "http://" bit, you will get a "Page Not Found" screen.
Many web hosting companies allow you to set up sub-domains without cost. Often this can be done from inside your hosting account's control panel (cPanel, a very popular control panel) makes this ver easy to do.
You don't need to register a sub-domain but you may still have to wait a few hours for the sub-domain to "propagate" to all the domain servers in the world.
Setting up a "www2" address
Just set up a sub-domain called "www2" and direct it to a folder which you set up on your server in the normal way. Then create a web page called "index.html" or "index.htm" and put the appropriate content in that file.
There are quite a few reasons why you might want to use a "www2" (or "www3" etc.) address.
You can find out more information on this topic here.