IIS authentication in ASP.NET

Hey all,
I have a C# ASP.NET app and I have set up windows NT authentication in
IIS. It works just fine, my question is, how can I get IIS to use the
current windows user information to log into the site? My client is
sick of always re-entering the authentication information after loging
into windows.

Any ideas? Im running IIS 5 and ASP.NET 1.1

P.S. here is a bit of info as well:

Integrated Windows Authentication is Checked in IIS
Annon access is NOT checked in IIS

impersonate is set to true in web.config
authentication mode is set to windows in web.config


So please can someone tell me how to stop it asking for a login when
you open the site...

ok well thanks for that, Im still relativly new to IIS security, and am
trying to get my head around it.

Do you completly understand the article?

I have researching this for a few weeks now and the article above
seemed to do the trick. The issue appeared to be that when the user was
requesting the page, they were typinh in the IP of the webserver, and
acording to the article, of the computer name in the address has dots
(i.e. 192.168.1.222) then the browser assumes that the site in is the
Internet and does not automatically send the username and passwords...

Thanks for the reply