Reading the documentation of "client actions" I realize that with the following lines:

start: function () { return $. WHEN ( this._super (), / / Simply read the action res.widget Should this display object new instance.web.Model ('res.widget'). put ( 'read', [[this.widget_id], ['title']]) . then (this.proxy ('on_widget_loaded')); }

You can read data but can not find the model to update the data in that or any model, at first I thought it was the save () method of backbone js but reading the documentation made think OpenERP instance.web.Model