GISTech utilise DWR for Ajax communication with the server.
DWR is an open source Dynamic Web Remoting project, that is
available to download from the link below.
Out of all the Ajax implementations we have seen this is the lease
intrusive and easiest to implement. It's seamless integration
with other opensource projects like Spring and Struts, offers huge
benefits, give the Ajax classes full access to the rest of your
service beans.
And it is fast. If you click on this button a
request will be made to the server and the response will