The PureMVC Framework Code at the Speed of Thought

hi all,

i'm new of pureMVC and it's really hard to understand it..

first, is there a good tutorial to start?

second, i need to implement an inter modules communication.
i've read this post http://forums.puremvc.org/index.php?topic=49.15 and i downloaded the code provided by "rock"..
in the sample i found TestMessageController class that listens for notifications...so i would modify this class to change data within a module...for example a module sends a notification (note and body)...then an other module takes the body and changes his views..(e.g. data provided into a datagrid).
how to rich this goal?

finally, if modules are unloaded is there a right way to follow?

thanks a lot

Regards Lorenzo