Is it really supported by any popular web technologies?
Absolutely! First of all, such a JFDraw Web Start application can be deployed under any major web servers, such as Internet Information Server(MS-IIS), Apache web server, Tomcat web server and etc.The only work you need to do is to add a new mime type, And then, since JFDraw Web Start Solution is focused at a regular automatic HTTP Response, you can easily use your favorite programming tool, such as jsp/servlet, java script, vb script, c#, perl, cgi and etc. to build such a dynamic HTTP response .