A Quick Note is a hidden note that can be given to any and all fields in the system. It is activated by right mouse clicking on the info button next to the field:
The following menu appears, select the Edit QuickNote selection:
An input area appears, in which you can type the note:
Clicking on the Save button to save. From now on the note appears when the mouse moves over the field. The system tells you that there is a Quick Note by highlighting the info button.
To remove the note, edit it and delete all the text.