0x600D FRAMEWORKMSG_MASSIVE_REQ

1   byte    type    //MassiveMsgType
if(type == MassiveMsgType.Header)
{
    2   ushort  wMsgCount
    2   ushort  wRealMsgID
}
else
{
    4089    byte    realMsgDataSegment
}

enum MassiveMsgType : byte
{
    Data = 0,
    Header = 1,
}

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A word from pushedx about 0x600D