Ah thank you the clarification, apologies 
The interaction with Modules and apps are done via inputs and outputs.
You have to define what data is going to be an output of the module so that components and queries in the main app can be passed data, triggered, run and controlled.
You can read about outputs here! I wish it was as easy as invoking an event but due to modules being re-usable in many apps it would cause bugs if you hard coded in queries or components.