The “Application Download” sample makes two subscriptions to the ADL Call Service (one in the “main” application; one in the Download Library) - so there are two Call Event handlers.
The ADL User Guide doesn’t mention what’s supposed to happen in this case! 
Presumably, the first subscribed handler gets to see the Events first, and then the Events are passed through to the second subscribed handler 
Is that right?
Are there any issues I need to beware of with this?
(In the sample, the two handlers each handle a different set of Events)