By Flex using BlaseDS provides a messaging framework that allows you to publish and subscribe to messages. In his recent post Christophe Coenraets has provided an example (includes source code as well), that shows how can you do something similar.
I am in middle of understanding the architecture, hoping to build an article that explains how to use the same constructs in your application as well.
You didn’t include the link to the example provided
Thanks for pointing the error. I have created a hyperlink.