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1. Visit
2. Download Dukematcher (DM) - a free download
3. Configure Dukematcher with your nickname, point it to your Duke install.
4. Come get some!

Don't forget, it is also handy to join the Facebook group (link on the above site) where players often post when they are looking for a match. Although Dukematcher has its own room list where you can see anyone hosting a game.