In this 4 part series, Bob Brumfield and Erwin van der Valk from patterns and practices shows you how to build a modular application using the recently released Composite Application Guidance for WPF and Silverlight - February 2009 (also known as Prism V2).
Part 4. Decoupled Communication:
This webcast demonstrates how to communicate between the different modules.
What is Prism v2? Watch this video.