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        The DOS device/file-handle table (Internal)

        The DOS-handle table(s) contains information about open-files
        and devices. The format is (a least in DOS 3.30):

        Offset Size    Contens
        --------------------------------------------------------------
        00-03  DWord   Pointer to next table (0000FFFF if last)
        04-05  Word    Number of entries in table
        06-            Entryes (see below)



        DOS device/file-handle table (single entry)

        Offset Size    Contens
        --------------------------------------------------------------
        00-01  Word    Number of file handles, using this entry
        02-03  Word    File open-mode (specified in AL when the file
                       is opened by INT 21h, 3Dh).
        04     Byte    File attribute (specified by CREATE or CHMOD).
        05-06  Word    Handle flags/drive
                       0-5:  Drive (A=0, B=1 etc.)
                         6:  0=Handle must be flushed before closing
                             (there has been written to the file).
                         7:  1=Character device, 0=Block device
                       8-B:  Unknown (always zero)
                         C:  1 if handle is owned by current process
                       D-F:  Unknown (always zero)
        07-0A  DWord   Address of device-driver used by this handle
        0B-0C  Word    First cluster in file
        0D-0E  Word    File time in packed format
        0F-10  Word    File date in packed format
        11-14  DWord   Current file length
        15-18  DWord   Current address of read/write pointer
        19-1A  Word    Number of clusters owned by handle
        1B-1C  Word    Current cluster
        1D-1E  Word    Sector containing directory entry (Note: for some
                       reason DOS uses the sector-number here and not the
                       cluster number. I expect this to change with
                       DOS 4.x).
        1F     Byte    Directory-entry-number in sector (see above).
        20-27  Bytes   File/device name
        28-2A  Bytes   File/device extension
        2B-30          Unknown (always zero)
        31-32  Word    Segment of owners PSP
        33-34          Unknown (always zero)