IE Blog discusses the parental controls of Internet Explorer 7:
If you haven’t heard about Windows Vista Parental Controls, be sure to read Brian’s blog post which gives a great overview of the feature. I’d like to fill you in on the great features IE7 adds to Windows Vista Parental Controls.
IE7 offers two features which will enhance the Windows Vista Parental Controls experience for both parents and children. As Brian described, when Parental Controls have been enabled on a child’s account, Windows will block web navigations to particular sites. When a top level navigation is blocked, preventing navigation to an entire site, the child will see an error page which provides a link to request permission from their parents to view the content.