On this window you will see the workareas are open at the current line of your source code, for the current thread.
The currently selected areas is marked with a checkbox.
In the future we may extend this window so you can see the properties of an area (such as BoF(), EoF() and RecNo()) and/or the field names and their values for the current record.
When your app does not include the X# runtime then a message will be shown that the runtime has not been loaded: