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I'm running a WebGL application within an iframe using embedded html content.  Sofar this works great, but I'm looking to modify an action on the webgl application using a button from indesign.  I've set a javascript sendmessage on the button itself, but this cannot communicate within the iframe.  What would be the best approach for communicating the two?
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Communication between documents can be tricky. Try this method:

http://stackoverflow.com/questions/9153445/how-to-communicate-between-iframe-and-the-parent-site
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