How to learn input.vars or the Record ID within "On Delete" script?

Seems that both OnDelete.Validate, and OnDelete.Success, are unaware of the form's input vars??

The same scripts that work in OnAdd, and OnEdit, don't work when in OnDelete.

Seems not even aware of its own record ID, at least not via input.ID.

I must be missing something... :-) I have searched the dox and forum.

How do I learn at LEAST the record ID, so I can look up the field values via x = <Form>[ID = input.ID]; ?

In this our first brush with On Delete, we are updating some record counts successfully during Add, and Update. But if we can't do same during Delete, the whole thing is incomplete :-/

Thank you!!