This attribute shall specify the current in-focus application, identified using an Application ID,
catalog vendor ID and the corresponding endpoint number when the application is represented by a Content
App endpoint. A null shall be used to indicate there is no current in-focus application.
This attribute shall specify the current in-focus application, identified using an Application ID, catalog vendor ID and the corresponding endpoint number when the application is represented by a Content App endpoint. A null shall be used to indicate there is no current in-focus application.