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Int 2F Fn 110B CU - Network Redirector (dos 3.x Only) - Unlock Region Of [N]
AX = 110Bh
BX = file handle
CX:DX = starting offset
SI = high word of size
STACK: WORD low word of size
ES:DI -> SFT for file
SFT DPB field -> DPB of drive containing file
Return: CF set on error
AL = DOS error code (see INT 21/AH=59h)
STACK unchanged
Note: this function is called by the DOS 3.1-3.31 kernel; DOS 4.0+ calls AX=110Ah instead
See Also: AX=110Ah,INT 21/AH=5Ch
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