Log file (INT 21h, EBh - Novell NetWare 4.6)

        Entry:
          AH = EBh
          DS:DX -> ASCIZ filename
             if function C6h lock mode 01h:
                 AL = flags
                        00h log file only
                        01h lock as well as log file
                 BP = timeout in timer ticks (1/18 second)
        Return:
          AL = error code