Certified LabVIEW Associate Developer (CLAD) Practice Test

The feature that is used to programmatically access properties of controls at runtime is the Property Node. Property Nodes in LabVIEW provide a means to access and modify the properties of front panel controls and indicators dynamically while a VI is executing. This is particularly useful for updating control appearances, reading values, or changing settings based on the application's logic.

By utilizing Property Nodes, developers can target specific properties of a control—such as its value, visibility, or color—and change these properties as needed during program execution. This dynamic interaction greatly enhances the flexibility and responsiveness of LabVIEW applications.

In the context of this question, while other options like Event Structures manage user interactions and enhance event-driven programming, the State Machine provides a framework for managing different application modes, and Dynamic Dispatch allows for polymorphism in object-oriented programming, none of these features directly facilitate the runtime access to properties of controls as the Property Node does.