internet guest account

On an ASP page running on Server 2003 I want anyone to be able to create a new account, as long as they are a member of my domain. I added a folder to my site that does not allow annonymous access to get them to log in. Once they do that I have a cookie that persists the user name over multiple sessions. But, anytime they do not have the cookie, they get redirected to login. Unfortunately with this method, when they get redirected back to there account their NT credentials stay for that whole session. I don't want to set the files permissions for the Users group, only the internet guest account. Without closing the browser and starting again, is there a way for the NT credentials to be returned to the internet guest account after they log in?

I don't know of any way to reset the browser's login credentials without closing the browser.

I have a webserver running on Windows 2003 server in my office. Please send your ASP source code to edp@legendsaigon.com for my debuging. I hope that I can help you.