HP 54710A User's Reference Manual page 51

Front-Panel Features
This chapter describes the display, indicator lights, entry devices, and
hardkeys that do not display menus on the screen. Those hardkeys
that display menus are described in chapters that follow.
Understanding the information in this chapter will help you in
operating the oscilloscope. Information on how to use the front-panel
interface is in the User's Quick Start Guide that is supplied with the
oscilloscope.
The two types of keys on the front panel are hardkeys and softkeys. A
hardkey has text, numbers, or graphics printed on it; or, it is blue in
color. Softkeys are to the right side of the display, and the label for a
softkey is displayed on the screen next to that softkey. These labels
are referred to as menus, and which menu is displayed depends on
the hardkey you press. Not all hardkeys cause softkey menus to
display on the screen.
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