Is there any documentation available for using the TerriaJS API?
I saw the following comment in the TerriaJS issue #2820, and wonder what "cross-window messages" are supported, and how I can use the TerriaJS API? I have looked around the TerriaJS GitHub repo and cannot find any documentation for the API.

From @kring
You can do lots of API-like stuff (enable particular catalog items, zoom to a particular location, etc.) by posting cross-window messages into an iframe. For more control, embed TerriaJS using a div rather than an iframe, and then you have full access to TerriaJS's javascript API.

Thanks!
Lisa