A session for a Web application can be established between a Web server of a Web domain and a browser of a client of a local domain. The Web application can be constructed so that view and controller functionality are provided by components executing in the Web domain and where model functionality is provided by components executing in the local domain. During the session, an expeditor runtime component can be served from the Web domain to the local domain for the Web application session. At least one widget can be served from the Web domain to the local domain, where the widgets execute within an instance of the expeditor runtime. End-user data utilized by the Web application can be isolated within the local domain so that it is not exposed to the Web domain.
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