The first instance cancels the query, and the second returns you to the previous screen or menu. When you click on it, the file should be automatically saved to your Macintosh Desktop. There should now be a new icon called Flagship on your Desktop. PF1 thru PF4 are only on the keypad. F1 is not the same as PF1.
TAB moves from field to field.
If you are in a query, you must hit this key twice. The first instance cancels the query, and the second returns you to the previous screen or menu.