The basic idea is to have a generator-driven app that allows a single Talk message (Tlon Talk DM) to be broadcast to a list of points, including (for instance) all sponsees of a point.
> :tell|cast 'Hello my sponsees.'
> :tell|call 'Hello my friends.' ~[~zod ~nec ~wes]
> :chat +dbugThe initial version, which sent messages to sponsees, was created in an Urbit build party in a single working session. A later session completed a Rudder-based front-end and added arbitrary input.