To locate Web sites, computers use IP numbers. But numbers like 66.102.7.104 are difficult to memorize. That's where DNS (domain name system) comes in. DNS allows us to use names like www.komando.com instead of numbers.

Behind the scenes, computers still work with IP numbers. Lists of matching names and numbers are kept by DNS servers. Enter an address, and your browser requests the matching number from a DNS server.

This lookup process takes valuable time. DNS servers typically keep only partial lists. Often, one request is forwarded through several servers. Many are halfway around the globe.

OpenDNS is a free service that aims to speed up this process. OpenDNS servers keep more complete lists than other DNS servers. Also, your browser's requests go to the OpenDNS server closest to you.

You don't have to download anything to use OpenDNS. It's available through a simple change of Internet connection settings. The OpenDNS site includes instructions for changing these settings in Windows. There are also instructions for those who connect through routers.

OpenDNS does more than speed up Web surfing. It can also keep you safer. OpenDNS keeps an updated list of phishing sites. If you get fooled into visiting one of these sites, OpenDNS will block it.