app.on('registered', function(data) {
 // Would return current AW app user (data.user);
});

app.on('activated',function(data){
  // data = {'user': {} , 'context': {} }
});

app.on('context-change',function(data){
 // data = {'user': {} , 'context': {} }
});

app.on('deactivated',function(data){
  // data = {} , App deactivation doesn't send any context.
});

// To show the count on app icon at chat header.
app.postMessage('showCount',{  
 'count': 10,
 'id'   : context-id // userId / streamId
}); 
 
 // To trigger desktop notification w.r.t user/stream
 app.postMessage('showNotification',{  
     'id'     : context-id
     'icon'   : null,          // App icon url to be shown in desktop notification.
     'title'  : title          // Title for the desktop notification. Ex :"Todo app remainder",
     'message': message        // body content for desktop notification. Ex : "Enabled desktop notification for todo app."
   });
   
 // To show the app update indicator on recent contact/stream view context.
 app.postMessage('showIndicator',{
     'id' : context-id // Context reference to show update indicator.
 });