INT 16H 02H: Query Keyboard Shift Status
Expects: AH 02H
Returns: AL KbdShiftFlagsRec (status of Ctl, Alt, etc.)
Info: Returns the current status of the shift keys. This is the same
as the byte at 0040:0017 in the BIOS Data Area.
Notes: ž Additional shift-key information is available via INT 16H 12H
for systems equipped with 101-key BIOSes.
ž There is no corresponding fn to set the keyboard shift status.
See Also: INT 16H (BIOS keyboard services)