Flex can be used for it
For complex, desktop-like applications, you can use Flex builder to configure event-driven dynamical application based on Flash or Flex components. 
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Flash VS AJAX »Flash VS AJAX
Flash or AJAX: which is better for Rich Internet Applications? »Flash or AJAX: which is better for Rich Internet Applications?
Flash is better »Flash is better
Dynamic content generation is difficult »Dynamic content generation is difficult
Flex can be used for it
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