Panasonic CF-73 Series Reference Manual page 9

Key Combinations
3
Select [OK].
NOTE
The Fn key lock function also works with Fn and other keys aside from Fx
Each user can select separate settings for whether or not to use the Hotkey settings.
*1
If MUTE is set, you will not hear a beep.
Fx
*2
" " indicates any function key from
F1 F10
to .
9
*2
.