Push data to vaadin app via javascript (yet another)

I have to extend our portal with further functions.
The portal (JEE/Javascript) combineds different webapps (struts,flash, flex …) in one gui (with iframes) and allows to exchange data (JSON object/arrays) between these via javascript.
At the moment I try to evaluate how can I push some data into an vaadin app.

The article
seems not work for me.
I can’t find the defined javascript function via the domtree and commit my data.

Is the any other way to push some data into a form or whatever of a vaadin app?

Thanks in advance