INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
	AX = 110Ah
	BX = file handle
	CX:DX = starting offset
	SI = high word of size
	STACK: WORD low word of size
	ES:DI -> SFTsee System File Table
	    SFTsee System File Table DPBsee Drive Paramter Block field -> DPBsee Drive Paramter Block of drive containing file
	SS = DOS DS
Return: CF set on error
	   AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	STACK unchanged
Notes:	this function is called by the DOS 3.10-3.31 kernel
	the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch
                                                                                

INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE
	AX = 110Ah
	BL = function
	    00h lock
	    01h unlock
	CX = number of lock/unlock parameters (0001h for DOS 4.0-6.1)
	DS:DX -> parameter block (see #02606)
	ES:DI -> SFTsee System File Table
	    SFTsee System File Table DPBsee Drive Paramter Block field -> DPBsee Drive Paramter Block of drive containing file
	SS = DOS DS
Return: CF set on error
	   AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
Notes:	this function is called by the DOS 4.0+ kernel
	the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch


Format of parameter block entry [array, but currently limited to single entry]:
Offset	Size	Description	(Table 02606)
 00h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	start offset
 04h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	size of region