code: public void openReadWrite(ReadStreamOld is, WriteStreamOld os) throws IOException
    {
      clearStatusCache();
  
      StreamImpl impl = openReadWriteImpl();
      //impl.setPath(this);
  
      os.init(impl);
      is.init(impl);
    }
docs: Opens a ReadWritePair for reading and writing.
  
  <p>A chat channel, for example, would open its socket using this
  interface.
  
  @param is pre-allocated ReadStream to be initialized
  @param os pre-allocated WriteStream to be initialized