In the most of case, Google Web Toolkit is using with AppEngine. But it can convert Java code to Javascript. It can used in s client-side only scripting environment. Yesterday, I wrote an example page with some Ajax requests to an external web services. That is very easy. I used Google Plugin for Eclipse.So that, after I finished coding, all I need to do is compiling the project. Then it will generate the html files and javascript under /war. Finally, I copy all files to my web root under Apache. Then done. I can view the webpage in a normal web browser.