It's possible even without IceFaces. It's part of basic
JSF. Just inject the second bean into the first one as a managed property. When the first bean changes, have it call a method in the second bean to notify it of the changes.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.