Int 6F/AX=0400h

AX = 0400h
BP = driver ID (see #03741)
DH,DL = major,minor address (optional)

Return:
AH = status (see #03744)
BP,DS destroyed

Desc: Reserve specified sub-addresses on an already-allocated driver for exclusive access

Note: This function is documented as present but unsupported in the drivers V_LTABLET, V_LPOINTER, and V_LTOUCH

See Also: AX=0200h"HP Vectra" - AX=0402h"SF_UNLOCK"