code: public synchronized byte[] getAdditionalInfo(int infoType)
  	{
  		if (infoType < addInfo.length && addInfo[infoType] != null)
  			return (byte[]) addInfo[infoType].clone();
  		return null;
  	}
docs: Returns additional information data corresponding to the supplied type ID, if it is
  contained in the message.
  <p>
  
  @param infoType type ID of the request additional information
  @return additional information data or <code>null</code> if no such information
  is available