If that external application produces a HTML page then yes, you could display this HTML page in an HTML iframe within a GWT application. Otherwise you must rebuild the UI of the external application in your GWT app and query the external application for data that you use to fill the UI of your GWT app. Querying for data can either happen directly from the GWT app using HTTP requests or indirectly by first querying a HTTP server you implement which in turn asks your external application somehow to provide the data.--
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