Security in webpage

Question

Hi All,
i have a doubt in windows authentication.
We have 2 Users and 2 webpages
User1 can see the webpage1 but he has no access to other page and vice versa.
How can we do this by using windows application?i   have run regsql on my server so now I have all the aspnet tables in my database (aspnet_Users,aspnet_Membership,aspnet_Roles etc). .can we do this with the help of these tables?