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=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    logical connection number (big-endian)
 05h    WORD    last record seen (big-endian)
                0000h on first call
 07h    BYTE    volume number (00h-1Fh)
 08h    WORD    directory handle (big-endian)
 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    Physical Record Lock Info [array]
        Offset  Size    Description
         00h    BYTE    task number
         01h    BYTE    lock status (see below)
         02h    DWORD   starting offset of record in file (big-endian)
         06h    DWORD   ending offset of record in file (big-endian)

Bitmask of lock status:
 bit 0: exclusive lock
 bit 1: shareable lock
 bit 2: logged
 bit 6: lock held by TTS