in TWhat is it?
Action List is an advanced To Do List.
From the Action List you can view your scheduled actions on any selected date. You can add, change or delete Production Items or ad hoc Action List items. You can change a Target Date or complete any scheduled action. You can drag items from the list of Items in the Inbox and set Tag Dates, Target Dates, Nuke, etc.
What happens if clicked?
The Action List window will open, displaying the actions you have scheduled for the date you select in the calendar.