CONFIG.DAT structure :

Place  Description               Appearance                        Definition

 1st - Configuration file header [1]                               (ConfigHdr)
 2nd - Main configuration record [1]                               (ConfigRec)
 3rd - Modem response records    [0..ConfigRec.Modems.ResponseCnt] (ModemResponseRec)
 4th - Net address records       [0..ConfigHdr.NetCnt]             (NetAddrRec)
 5th - User limit records        [0..ConfigHdr.Limits]             (LimitRecord)
 6th - System event records      [0..ConfigHdr.Events]             (EventRecord)
 7th - Transfer protocol records [0..ConfigHdr.Protos]             (ProtocolRecord)
 8th - Packer records            [0..ConfigHdr.Archives]           (ArchiveRecord)
 9th - Message editor records    [0..ConfigHdr.Editors]            (EditorRecord)
10th - Char set records          [0..ConfigHdr.CharSets]           (CharSetRecord)

Note: All records can be of fixed length. Record size fields in
      ConfigHdr should be used to read records correctly to memory.

Note: ConfigHdr.FAreaSize, ConfigHdr.MAreaSize and ConfigHdr.DoorSize
      record size fields are always read from CONFIG.DAT in system path.