HP 54540 Series - Page 26

Front-Panel Overview
There are two types of keys: front-panel keys and softkeys. A
front-panel key has text or numbers printed on it, or it is blue in color.
Softkeys are to the right side of the display, and the labels for the
softkeys are displayed on the screen next to each softkey. These
labels are referred to as menus, and which menu is displayed depends
on the front-panel key you press. Not all front-panel keys cause
softkey menus to display on the screen.
In this book, key is used when referring to front-panel keys, and
softkey is used when referring to softkeys.