Hello, At the end of the task, write the result in a datastore, and the GWT application will periodically fetch the datastore to know if the task is completed. Or you can use the chanel API, the task at the end send a message to the channel to say that the task is finished. http://code.google.com/appengine/docs/java/channel/overview.html And the GWT implementation : http://code.google.com/p/gwt-gae-channel
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