Why do you think Hipmunk uses GWT (by which I assume you mean Google Web Toolkit)? The source for www.hipmunk.com pulls in jquery, but doesn't have the history

Why do you think Hipmunk uses GWT (by which I assume you mean Google Web Toolkit)? The source for www.hipmunk.com pulls in jquery, but doesn't have the history iframe or <module>.nocache.js reference that one would expect to see for a GWT application.