INT 15 - TopView - SEND MESSAGE - "SUBFROM" - RESET OBJECT BITS
AH = 12h
BH = 0Bh
BL = object
00h handle is DWORD on top of stack
pointer: reset control flags
keyboard: reset control flags
04h clear control flags on KEYBOARD object (handle on top of stack)
05h clear control flags on task's default KEYBOARD object
STACK:  DWORD   which bits to clear (see AH=12h/BH=0Ah"OBJECT")

See also: 1512

1512 - TopView - SEND MESSAGE - "SUBFROM" - RESET OBJECT BITS