gistfile1.js

// ViewF.js
initialize: function () {
  this.whisper.on('item-selected', this.onItemSelected, this);
}

// ViewF.js
onItemSelected: function (eventName, data, reply) {
  var message = 'Item <strong>' + data.itemId + '</strong> selected';
  this.$el.find('.event').html(message);

  reply.resolve('View F says hello!');
}

// ViewE.js
this.whisper('item-selected', { itemId: id }).then(function (replyMessage) {
  alert(replyMessage);
});