HTML5 postMessage

Hello there,

does Vaadin support the usage of the HTML5 JavaScript function postMessage()?
We’re building a WebApp containing multiple iFrames and it would be nice if the Applications inside the iFrames could communicate with each other on the client side in a secure way (although they might be hosted behind different domains) without the need to write JavaScript code.

For an example see:
http://html5demos.com/postmessage2