INT 21 - Novell NetWare - FILE SERVER - GET PHYSICAL RECORD LOCKS BY CONN&FILE
        AH = E3h subfn DDh
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status
            00h successful
            C6h no console rights
            FFh file not open
Notes:  this function is supported by Advanced NetWare 2.1+
        the calling workstation must have console operator privileges
SeeAlso: AH=E3h/SF=C8h,AH=E3h/SF=DEh,AH=E3h/SF=DFh

Format of request buffer:
Offset  Size    Description
 00h    WORD    0016h (length of following data)
 02h    BYTE    DDh (subfunction "Get Physical Record Locks by Connection and
                        File")
 03h    WORD    (big-endian) logical connection number
 05h    WORD    (big-endian) last record seen (0000h on first call)
 07h    BYTE    volume number (00h-1Fh)
 08h    WORD    (big-endian) directory handle
 0Ah 14 BYTEs   ASCIZ filename

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) size of following results record (max 1FEh)
 02h    WORD    next request record (place in "last record" on next call)
                0000h if no more records
 04h    BYTE    number of physical record locks
 05h    BYTE    number of records following
 06h    var     array of Physical Record Lock Info records (see below)

Format of Physical Record Lock Info:
Offset  Size    Description
 00h    BYTE    task number
 01h    BYTE    lock status (see below)
 02h    DWORD   (big-endian) starting offset of record in file
 06h    DWORD   (big-endian) ending offset of record in file

Bitfields for lock status:
 bit 0  exclusive lock
 bit 1  shareable lock
 bit 2  logged
 bit 6  lock held by TTS

.