Each GWT module can have only one entry point and you should have only
one entry point per page. A GWT module doesn't have to have any entry
point though so common code used by more than one page/module can be
moved to a common module inherited by them both. Is there a specific
scenario you have in
when you create a Google Web application porject,
it creates automatically a class called EntryPoint.
For example
http://code.google.com/p/gwt-mobile-webkit/source/browse/trunk/gwt-mobile-webkit/geolocation/samples/hellogeolocation/src/com/google/code/gwt/geolocation/sample/hellogeolocation/client/
