The Automation Controller also contains a list of the events that a custom control can trigger ( see Event Handling).

All communication between the controls at the frontend and the application program at the backend runs through the Automation Controller.

The ABAP Objects Control Framework has a similar function at the backend to that of the Automation Controller at the frontend. All method calls from an application program to a custom control run through the Control Framework. In order to avoid each method call establishing a separate connection to the frontend, the method calls are buffered in the automation queue. The automation queue is not sent to the frontend until you reach a synchronization point ( see Automation Queue).

Like the Automation Controller, the Control Framework has a list of control events. This list also contains the corresponding handler methods that need to be called when the event occurs ( see Event Handling).

The Control Framework also maintains a list of the control instances you have created. This list is the basis for the lifetime management of controls ( see Lifetime Management).