Using the screen system table, what can you modify through a LOOP AT SCREEN ... ENDLOOP construct?

The LOOP AT SCREEN ... ENDLOOP construct is specifically designed for modifying the attributes of screen elements in SAP ABAP programs. This includes properties such as whether a field is editable, whether it is hidden, or its visibility on the screen. By iterating through the SCREEN table, you can change various attributes of the fields dynamically based on the logic in your program.

When working with screens in SAP, it's essential to understand that while you can manipulate the attributes of screen elements, altering actual values or specific function codes directly within this loop construct is not its primary purpose. Instead, values can be set separately. Similarly, screen statuses manage how screens behave as a whole rather than focusing on individual element attributes.

Thus, the correct answer highlights the ability to change specific attributes of the elements on the screen dynamically, enhancing user experience and functionality without needing to define new screens or codes manually.