Commerce Reference Store iOS Universal Application (CRS-IUA) is a native iPhone and iPad application that interacts with the web application’s backend to send and receive data. A Universal app runs on both the iPhone/iPod Touch and the iPad. From a developer’s perspective, it is an iPhone and iPad app built as a single binary. Assisted Selling is designed to run only on the iPad. Assisted Selling differs in that it is intended to be used by an in-store associate who assists a shopper with his or her purchases.