Book excerpt: Your guide to designing apps that extend the capabilities of your SharePoint site. Take advantage of the most important new concept in Microsoft SharePoint 2013--the app. Led by two SharePoint experts, you’ll learn development techniques such as building app lists, creating event handlers, and the major classes in the object model that provide access to content stored in SharePoint. Get expert guidance on how to: Best design an app Develop a SharePoint-hosted app Develop a developer- hosted app Create and use lists Support notifications Program a client-side app with JavaScript Establish user security and SharePoint application security Get code samples on the Web.