const BYTE& operator[](unsigned int index) const;
BYTE& operator[](unsigned int index);
   Method Name operator[]  
    Argument - index The 0 based index of the byte of data to reterve (see GeLength for upper limit).  
  Description Allows a byte within the contained sequence to be accessed  
    Returns Returns a reference to the byte within the sequence  
  Remarks The non-const version can also be used to modify bytes within the sequence.
The reference provided is only valid until the next non-const call is made to the class, if you are relying on the value of the data returned, then copy the bytes value, don't store it as a reference.