In contrast to environments like JSP, ASP, and ColdFusion, Flex is not a templating system. MXML files are not templates that contain rules processed on the server to return a filled-in template. Instead, MXML code is compiled into a fully formed client application that is able to process server-side logic, and change what is displayed using its own client-side logic.
A Flex application does not go to the server every time the user interface must change or an event must be handled. Presentation logic and logic for server-side requests and responses is on the client in the SWF file that is generated when the user initially requests the MXML file. In Flex, changes to the user interface occur on the client, based on client-side code execution.
A Flex application makes HTTP requests to contact external data services, such as web services; this interaction with the server does not require you to refresh the application.
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