Set-level events are fired when something is about to happen on a Set, or when an action has just been performed on a Set. For example, one event is fired just after interpretation of a set.
For set-level events there is always an active Set, SetDef, Job, and Application. If the job description includes batches, there is also an active BatchDef and Batch.
There is never an active Field, FieldDef, Form, or FormDef present in set-level events. However, through the active Set you can walk through all forms in the Set, and for each form, you can walk through all fields in the form. The same works for FormDef and FieldDef which you can walk through via the active SetDef.
Set-level events:
Event descriptions (general info)
Where to find additional information about events and methods