Remote invocation... backwards

Hi there, I am trying to plan out an application in Flex that
communicates with a Java backend. I understand that I can make
RemoteObject calls to a Java class in the back end when I want to
get information, but what if that Java object wants to broadcast /
send some information to Flex?



Is there a remote event listener that I can implement, and
call from Java? Would using a synchronized dataset be the only way?
I'm a little concerned about performance using that method.



Thanks,



Charles