screen.setVT(vt);
   public Session5250 (Properties props, String configurationResource,                     String sessionName,                     SessionConfig config) {      propFileName = config.getConfigurationResource();      sesConfig = config;      this.configurationResource = configurationResource;      this.sessionName = sessionName;      sesProps = props;      sce = new SessionChangeEvent(this);      if (sesProps.containsKey(SESSION_HEART_BEAT))         heartBeat = true;      screen = new Screen5250();      screen.setVT(vt);   }