said by Lagz:That I'm not for sure. They offer a wide array of services. I just point my own dns servers(bind) at their servers. »www.opendns.com/
Treewalk is a local caching DNS service, similar to Bind, and specifically designed for Windows. Without it, OP has nothing to point to OpenDNS. All he can do is set his system TCP stack to use OpenDNS.