A check list, that can be customized to suit user-set check items (Dwg details, clashes, suppressed features etc...)
Hidden by default, but can be 'popped out' to float in front of Inventor window.
Simple check boxes that can be ticked when a given check or process is completed.
Remains as part of Inventor file, and comes along with copy designs, but either resets when copying design, or can be simply reset with single click.
Possibly Excel widget embedded??