Developer Networks in the 4D community are meetings in the evening, talking about 4D with a pizza and beer. That doesn't sound very professional for most of the customers (beside breweries). In Germany we established our network of professional 4D developers 4 years ago. The goals of the network were: - ways to keep current customers - ways to get new customers - ways get attention of potential customers In this presentation my objective is to show you how we accomplished this, and how you can do the same in your area.The main topics are: "prepare - establish - maintain - keep alive".