INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - LOG FILE
        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 = lock timeout in timer ticks (1/18 second)
                        0000h = don't wait if file already locked
Return: AL = error code
            00h successful
            96h no dynamic memory for file
            FEh timed out
            FFh failed
Desc:   add the location and size of the specified file to the log table and
          optionally lock the file
Note:   this function is supported by NetWare 4.6+, Advanced NetWare 1.0+, and
          Alloy NTNX
SeeAlso: AH=CAh,AH=D0h,AH=ECh"NetWare",AH=EDh"NetWare"