Custom apps can optionally define their own set of events that they publish topics for or subscribe to. If the custom app supports loose coupling, the topics for these events are declared in the App Spec and are visible in Mashboard when you add wiring to a workspace app. Presto developers should see Declare App Topics and Payloads for more information.

Basic apps, created in App Maker or created for views added to a workspace in Mashboard, use built-in or pluggable views that can have both standard and view-specific events. Basic apps publish topics and can subscribe to topics for both standard and view-specific events.