Chart FX for Java is a server side charting library. Everything is created on the server, and there is no client or applet. There are not client-side customization capabilites yet, just the ability of using image maps to display tooltips and to do drill-downs. Please download the trial version, wich is a full feature product, and includes all documentation and many samples.
Next version 7.0, it include a full interative ajax based image, with a lot of posibilities for client customization. You can learn more about it here: http://www.softwarefx.com/SFXJavaProducts/CFXforJava/roadmap.aspx. You can sign up for the beta, which will be available very soon.