http://blogs.msdn.com/b/jonbox/archive/2010/04/07/multiple-modes-with-preview-in-the-same-ie8-accelerator.aspxAs a test, I wrote a simple page that would leverage preview and execute across multiple modes in the same accelerator. UPDATE : Thanks to some helpful folks, I have found that accelerator preview blocks the passing of documentUrl as a safety precautionen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)