access authentication

I am programming a website which I need to have access authentication. This is something like experts-exchange website. I would like to know how do I program the “login” dialog box and how to retrieve data from it. Also, I would like to know how to maintain the user’s status. This means a user just has to enter password for once. After that, he can freely go to any page without submitting authentication information either explicitily or implicitily. Also, if the user restarts the browser, he will need to login again. How are all these done? Any help is appreciated!
I am using Microsoft Frontpage 2002
thanks