Which event can be directed to multiple widgets in a screen?

The On Parameters Change event can be directed to multiple widgets on a screen because it is designed to respond to changes in input parameters for a given screen or block. When a parameter changes, this event can trigger the execution of logic that may need to affect several different widgets simultaneously.

This capability is particularly useful when you have a screen that must update various components in response to a single event, like a user changing a filter or selection. Rather than each widget needing to individually handle changes, the On Parameters Change event allows for a centralized way to react to updates, making your application more efficient and easier to maintain.

In contrast, the other events listed—Ready, Render, and Destroy—are more focused on lifecycle management and do not inherently allow for direct communication with multiple widgets in the same way. The Ready event is typically used to initialize components when a screen is first loaded, the Render event deals with browser rendering of the widgets, and the Destroy event is used for cleanup when a screen or component is removed. These events typically pertain to single instances or the overall life cycle of the screen, rather than the dynamic interaction between multiple widgets.