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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"
Category: Vendor-specific BIOS Extensions - Int 6Fh - H
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