I've written a set of tutorials on how to convert VisAD standalone applications to collaborative applications. Before you're frightened off, note that the simple application in the walkthrough is converted in just 4 steps, and those steps will be roughly the same for even the most complicated applications. There are 3 main pages: http://www.ssec.wisc.edu/~dglo/visad-collab.html is an overview of the steps involved in making an application collaborative. http://www.ssec.wisc.edu/~dglo/walkthrough-start.html is a step-by-step conversion of a simple standalone application. http://www.ssec.wisc.edu/~dglo/visad-widget.html is a brief discussion of making a graphic VisAD widget collaborative. I'd be happy to hear any comments, suggestions, corrections, etc. you might have on these pages!