Bitfields for keyboard shift flags 2:
Bit(s)	Description	)
 7	SysReq key pressed (SysReq is often labeled SysRq)
 6	CapsLock pressed
 5	NumLock pressed
 4	ScrollLock pressed
 3	right Alt key pressed
 2	right Ctrl key pressed
 1	left Alt key pressed
 0	left Ctrl key pressed
SeeAlso: #00587,MEM 0040h:0018h,#M0011