Is there any way to determine which movie an ExternalInterface.call came from?

Question

On my page, I'm going to embed multiple Flash files that use ExternalInterface to communicate back to the page. When the page receives the ExternalInterface calls, is there any built-in way to determine which swf the call came from?

I don't mind giving each movie a guid FlashVar and attaching that to each ExternalInterface call, but I don't want to duplicate more tested functionality.

Answer 1

What you're think is really your only solution. Passing unique IDs to the SWFs is the only way.