Thanks Cliff.

Sorry I should have said - I'm working within the Flash Player runtime environment.  Would the same advice apply here?

I'm probably getting myself in a muddle and will study the HelloFlash example in more detail 

I've been having lots of fun with PureMVC, many thanks for a job done so well.  Within a day I managed to get a basic application working and am very excited about how things are beginning to "click".  However I'm struggling with one concept, and please forgive my ignorance if I have missed the point and the solution is obvious (I do try and RTFM but my OOP language isn't fluent yet!).

ApplicationFacade is a Singleton.  So how do I get 2 of my (not so wonderful) applications "going on" concurrently? (e.g. 2 calculators)

So far I'm thinking I need my Proxies and Mediators to be composites and then I should shift everything down a node or two?

Thanks for any advice.