So now I'm wondering what on god's earth had stopped you from searching for "GWT sample applications"? One of the first results is this:
Welcome to GWT Examples[
^]. Even a "high end" demo (
Wallet Infentory Application[
^] &
Sources[
^]) can be found on that page, if you find out what they meant by that feel free to come back and leave me a comment about it.
Regards,
Manfred