INT 15 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - SET DEVICE HANDLER ADDR
AX = C207h
ES:BX -> FAR user device handler
Return: CF set on error
AH = status (see AX=C200h)

See also: 33000C

15C207 - SYSTEM - POINTING DEVICE BIOS INTERFACE (PS) - SET DEVICE HANDLER ADDR