Authenticate based on the NT user ID

I have a requirement that goes as follows:

There would be a web-based application that would be built on weblogic application server. The web server would also be weblogic. The user would login into his NT machine and can then open the browser and type the URL to this web-based application. This applicaiton would only be accessible from intranet.

When the user types in the URL, there would be no login screen presented to the user. Instead, it is required that the user directly reaches the homepage of the application. Since, not all the users would have access to this application, there is a requirement to get this user's NT loginid and validate the same against the application users.

Please can anyone guide.

It is possible to authenticate against an NT or Active Directory, however I'm not aware of any way to forward one's credentials from the machine through the browser to the server without a user entering them.
Configure Authentication and Identity Providers

Also please check if this is what you are looking for:

Configuring Single Sign-On with Microsoft Clients
http://e-docs.bea.com/wls/docs92/secmanage/sso.html

This also explains IE Browser along with Kerberos configuration on Weblogic.