Customizing Silverlight install experience
If you do not have Silverlight plug-in installed in your browser, the default experience is the Install Microsoft Silverlight message flashed on your screen.
The highlighted portion of the html file is actually responsible for this. If you want to customize this message to tell the user why he needs Silverlight and how does it improve his viewing experience, you need to fiddle with this code. The same can be achieved also by inserting the <PluginNotInstalledTemplate> piece into the aspx page.
If you already have Silverlight installed, to test this out, just disable the add ons
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