code: public void addAuxiliarySource (DObject source, String localtype)
      {
          source.addListener(this);
          _auxes.put(source.getOid(), localtype);
      }
docs: Adds an additional object via which chat messages may arrive. The chat director assumes the
  caller will be managing the subscription to this object and will remain subscribed to it for
  as long as it remains in effect as an auxiliary chat source.
  
  @param localtype a type to be associated with all chat messages that arrive on the specified
  DObject.