Please see http://dancewithnet.com/lab/yui/bug/3.1.0pr1/console/universal-console.html

1.Create a universal console and use it in 3 YUI instance. eg:

<script src="http://yui.yahooapis.com/3.1.0pr1/build/yui/yui-min.js"></script>

<script>

//instance 1

YUI().use('console',function(Y){

  (new Y.Console({

    logSource : Y.Global  

  })).render()  

  Y.Node.one('body').addClass('yui3-skin-sam');

  Y.log('It is successful to create a univarsal console.','info','YUI instance 1');

});

//instance 2

YUI().use('event-custom-base',function(Y){

  Y.log('It appears in Log Console.','info','YUI instance 2');

});

//instance 3 

YUI().use(function(Y){

  Y.log('It appears in Log Console too.','info','YUI instance 3');

});

</script>

3.Because YUI instance 3 doesn't use event-custom-base module, so Y.fire is undefined.

4.In order to use a universal console, I must use event-custom-base module. It's inconvenient.