broadcast
Publishes data to every current subscriber on this screen. Suspends until every current collector has received it; a broadcast with no active subscribers (e.g. the target tile isn't currently composed) is simply dropped, not queued — matching ScrollColumnTile's own documented behavior of being a no-op when no tile with the target id is mounted.
Parameters
data
the value to publish — carries its own tileId identifying the intended recipient(s).