Multiple windows on desktop

This post might belong to the As3 forum, but i think i might fit in here too…

I am trying to get 2 “windows” or swf to to connect together (one sending event and the other receiving them, one way.) for a desktop application offline. First i thought I should use the localConnection, but it doesnt really work offline, i get errors and sandbox violations
Now i am considering the nativewindow with a AIR app. All this using Flash CS5 (not flex). What is the best way to proceed?