Int 21 Fn C6  - Novell Netware - Synchronization Services - Get Or Set Lo  [N]

   AH = C6h
   AL = subfunction
       00h set old "compatibility" mode (default)
       01h set new extended locks mode
       02h get lock mode

Return: AL = current lock mode

Note:  this function is supported by NetWare 4.6+, Advanced NetWare 1.0+, and
     Alloy NTNX
   the locking mode should be 01h for NetWare 4.61+ and Advanced
     NetWare 1.0+ locking calls, and 00h for all older calls

See Also: AH=BCh,AH=C4h,AH=D0h