code: static synchronized void userHasLogged(EnhancedDebugger debugger, String user) {
          int index = getInstance().tabbedPane.indexOfComponent(debugger.tabbedPane);
          getInstance().tabbedPane.setTitleAt(
                  index,
                  user);
          getInstance().tabbedPane.setIconAt(
                  index,
                  connectionActiveIcon);
      }
docs: Notification that a user has logged in to the server. A new title will be set
  to the tab of the given debugger.
  
  @param debugger the debugger whose connection logged in to the server
  @param user     the user@host/resource that has just logged in