. . "Windows defines several built-in groups, including Administrators, Users, and Guests.To allow or deny access to certain groups of users, add the element to the authorization list in your Web application's Web.config file.e.g.
<>
< roles=Domain Name\\Administrators\"> < !-- Allow Administrators in domain. -- >
< users=*> < !-- Deny anyone else. -- >
< /a" . .