The call is non-blocking. When response arrives, you can populate the widget and call setWidget() on the display. Start() javadoc<http://google-web-toolkit.googlecode.com/svn/javadoc/2.1/com/google/gwt/activity/shared/Activity.html#start(com.google.gwt.user.client.ui.AcceptsOneWidget, com.google.gwt.event.shared.EventBus)> elaborates on this.
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