It's possible to share All the nodes across N cavas, i mean,
update your scene once and paint exactly the same scene across the canvas, how to do this?? :?
is MUST replicate the resources, because they are diferent contexts??
I have modified the TestSwing example, but I most replicate everything per canvas to get it working, and set an Implementor to multiples canvas is not working 
Thanks a Lot!!
Right now, this is the only way to reliably share contexts: http://www.jmonkeyengine.com/jmeforum/index.php?topic=7168.0
That's because the current jME display system does not really support multiple contexts…