•  If Ajax Uploader detects SilverLight is installed on your PC, It will use the SilverLight solution.
•  If Ajax Uploader detects Flash is installed on your PC, It will use the Flash solution.
•  If Ajax Uploader detects Iframe is supported on your Browser, It will use the Iframe solution. 
• Ajax Uploader will render as default ASP.NET upload control. 

You can disable the flash and silverlight by code.

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