limiting internet access

Well, you can remove all DNS server entries on the Win98 machine, and then modify the HOSTS file on the machine, pointing the IP address to the URL of the site you want the box to go to.
In doing this, anytime anyone on the machine types in www.whatever.com, with no DNS servers configured, the user will not get name resolution.
But, if they type in the URL of the site you want them to go, then that will work just fine, since HOSTS files also provice name resolution.

Now, if a person types in HTTP://XXX.XXX.XXX.XXX (an IP address of a remote web site) that will STILL work. DNS is only for name resolution, to resolve a URL with an IP address. So, if the user has an IP of a web site and they put it in the browser line, it will work.

If you want to prevent that, you need to set up a Proxy server.

hope this helps

This answer applies to browsing the web using Internet Explorer.

1) Go to Tools/Internet Options/Content
2) Enable Content Advisor
3) Under the Ratings Tab, you can set the rating for Language, Nudity, Sex and Violence
4) Under the Approved sites, you can enter which sites you are allowing for access, which sites are disallowed access.
5) The General and Advanced tabs are for other configuration purposes

I think Step number 4 suites your purpose well.

Hope this helps.