INT 16 - KEYBOARD - GET 122-KEY SHIFT STATUS (122-key kbd support only)
	AH = 22h
Return: AL = shift flags 1 (see #00587)
	AH = shift flags 2 (see #00588)
Notes:	use AH=09h to determine whether this function is supported
	K3PLUS v6.00+ supports this function as an alias of AH=12h
SeeAlso: AH=02h,AH=09h,AH=12h,AH=20h,AH=21h