How to host Multiple Web application in IIS 6 server win 2003.

Since the web server can not read minds, it has to use something to tell requests apart between applications/sites. You have three choices:
1) different ports and one IP
2) different IP
3) using CNAME aliases
Here is the howto for IIS6 for all three cases, look at the menu on the left: http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/55161df5-5f55-4ed3-bb26-b675153d49ac.mspx?mfr=true[^]

This later option is used by the service providers to do simple web hosting. The browser sends out a Host header[^] in the http request. This is used by IIS to distinguish between targets on the same web server. Simple and easy. All you have to do is add a CNAME alias with a friendly name to DNS at the level you need (in your case this will be most likely the company DNS server).
Let's suppose, your machine is server1.domain.com, and you have app1 and app2, than you should register two CNAME records[^] in the DNS: app1.domain.com and app2.domain.com, both pointing to the original server name. Than you can assign these aliases to your sites. That's all.

I agree with the above posters. There is a lot of information on the web to help you with the same. Hope the below will point you in the right direction.

Try the following for each website -

1. Create a virtual directory under 'Default web site' with appropriate name (the name you want after slash [/] )

2. Set the following properties appropriately
- Application pool (optional)
- default document
- security (anonymous/basic/windows)
- correct version of asp.net


I am Assuming you have a working webserver and can access the default website.
There is sufficient documentation on the web for each of the points above.

Cheers