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 Notifications (Growl'esque) Notifications in Opera Unite: 
 
  
widget.showNotification('This is awesome!');
Doesn't need to be inside of URLs or window.onload. 
 
The second parameter - function is quite mysterious.  
All I can find now is that Opera devs use it like this: 
widget.showNotification(msg, function() { opera.postError(msg)} );
On further investigation - it does what advertised (opens URLs on click): 
widget.showNotification('This is awesome!', function(){ 
     widget.openURL('http://opera.com/'); 
});
(It doesn't have to open URLs, but without event object - you don't have much to choose).
 
 
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