Signal an event originating here.
The message event is fired on a Window object when the window receives a message from another browsing context.
A work in progress MESSAGE signals a specific event of interest elsewhere in the lineup.
CLICK MESSAGE hello
MESSAGE emits an event via window.postMessage identified as action publishSourceData in alignment with other signaling in wiki. The specified topic is provided redundantly as name and topic fields. Use LISTEN to handle these events from here and elsewhere.