Abstract: The come of new web development patterns has raised new possibilities for web applications. AJAX, the enabling technology for these new patterns, is a consolidated approach for the web development, and new tools and frameworks to simplify its use are developed continually. With these new techniques it is possible to develop a new generation of web applications, that are near to the Software as a Service pattern. An example are dynamic web pages that are quite similar to complex client application, that enables the use of a server, or even of multiple servers, only to fetch data, that are then shown and elaborated according to the application logic embedded into the web page. This text examines these new possibilities, the technologies to realize them exploring also technical limits and security issues and, finally, presents a sample application based on them.

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