Keysight Technologies PXA N9030A Getting Started Manual page 33

Front and Rear Panel Features
Front-Panel Features
If a displayed key label shows a small solid-black arrow tip pointing to the
right, it indicates that additional key menus are available. If the arrow tip is not
filled in solid then pressing the key the first time selects that function. Now the
arrow is solid and pressing it again brings up an additional menu of settings.
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