Triggering a Word that has more than one associated Action presents a choice of the Action to carry out. This choice dialog is called a "Pick List," and appears at the cursor location. Use the arrow keys to select the Action you want and press Enter.
Usage: You would use this feature to simplify. For example, you might associate three different data stamp formats with the Word "date." When you trigger "date" you get a list of the choices, use the arrow keys to select the format you want, and press Enter.