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        Log logical record (INT 21h, D0h - Novell NetWare 4.6)

        Entry:
          AH = D0h
          DS:DX -> record string
            if function C6h lock mode 01h:
               AL = flags
                   bit 0: lock as well as log the record
                   bit 1: non-exclusive lock
               BP = timeout in timer ticks (1/18 sec)
        Return:
          AL = error code