Sharp PC-W100T Operation Manual page 40

System Function Keys
The notebook has special system function keys which activate key functions printed
on keys serving dual functions. When pressed in conjunction with the Fn key, these
keys set specific system parameters and are sometimes referred to as "hot keys".
2
Fn + F8 and Fn + F9 do not function.
2-8 Understanding the Keyboard Layout
toggles between video display output to the LCD screen,
SimulScan (display on the LCD and external CRT monitor), and
the CRT.
decreases the LCD screen brightness.
increases the LCD screen brightness.
turns the screen backlighting on or off.
puts the notebook in suspend mode (to RAM or to Disk,
according to the setup selection). To resume normal operation
from Suspend to RAM, press any key. To resume from Suspend
to Disk, press the power switch.