If you already have Webstructor code downloaded and installed, there is nothing preventing you from extending it for your own purposes.
For example, you might want to build more intuitive Projectors and Views or write more intelligent Server Container.
For this purpose, here is documentation onVisual Mind Worlds API.
Also, here is live code ofservlet handling requests from client Applets and redirecting them to Servers loaded on server side.
Be aware, code is dirty and badly documented. This will be improved one day, probably. Right now, it is really not for sure that it worth looking at this.
(C) Copyright 1988-1998,2001 Anton Kolonin