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• The client web page is creates the XmlHttpRequest, and thus the connection from the web page to an application on the server. • Part of that connection determines how the response can be produced to the client code - via the use of a ''callback'' routine. • The callback routine is called multiple times which come with a status code which indicates the reason for the invocation. • When a request can be successfully completed by the server application, a response should also be produced.