Similar to the QSocks example, Qlik's Backend API is a wrapper around selected Qlik Engine API methods, but with the difference that the Backend API is aware of the context, which is a WebSocket user session with the current Qlik Sense app.
This means, for example, that if you were to leverage the Backend API to pass on a selection within a visualization extension, the Backend API would utilize the current WebSocket connection and the app in which the extension is used to pass on the selection, for example, via the selectValues method:
var self = this;$element.find('li').on('click', function() { if(this.hasAttribute("data-value")) { var value = parseInt(this.getAttribute("data-value"), 10), dim = 0; self.backendApi.selectValues ...
