INT 10 - HUNTER 16 - SET BACKLIGHT LEVEL                                        
	AH = 64h
	AL = level (0..15)
Return: nothing
Desc:	set the LCD(Liquid Crystal Display) backlight level to improve visibility in bad lighting
SeeAlso: AH=63h,AH=65h,AH=74h,AH=78h"HUNTER",INT 15/AH=74h