There are several ways to configure DWR:
We have documented the DWR additions to web.xml, and enabled access to parts of the Java Servlet API, to understand supported environments or see the various projects that DWR integrates with.
In addition to the documentation in this handbook there is also a few sources of generated documentation:
The JavaDoc for the latest development version of DWR is probably the best place to look for detailed documentation right now. The class level javadoc is fairly good - although there isn't enough package documentation yet.
As of the latest development version, we are also generating DTD-Doc pages. Since the DTD files are versioned, we don't separately publish from old source trees. All you need should be in the DTD versions supported by the latest version of DWR.