NEC VERSA 4200 Manual page 69

Function keys are application-driven. See the specific application's user
guide for information about how each function key works within the
application you are using. See the following function key combinations.
Fn
F2
+
Highlight
Fn
F3
+
LCD/CRT
Fn
F4
+
Fn
F5
+
Backlight
Fn
F6
+
Speaker
Fn F7
+
P/M Lev
Fn F12
+
ScrLock
Fn + F2 Highlights text. Select On to highlight or Off for no
highlighting. (Off is the default.)
Fn + F3 LCD/CRT (Only operates with external monitors attached)
Fn + F4 Expands the text and graphic screen area in video modes
with resolutions below 800 x 600 as well as with DOS text.
Toggle the key combination to either expand to the
maximum screen width or retain the smaller screen area.
Fn + F5 Backlight (auto/standard)
Fn + F6 System Speaker Volume (off/high/med/low)
Fn + F7 Power Management (P/M)
Fn + F12 Scroll Lock On/Off
Using the Hardware 4-3