Karen is a teacher and she has a lot of Smart Board lessons that she needs to port over to the next generation of smart boards called "Promethean Boards." Leo says that these are interactive white boards that are in essence a Windows screen that you can write on. Karen could just use Google Chromecast and a projector to project onto the wall. But moving the smart board lessons to the Promethean format is a challenge. Many of these are proprietary that lock her into their ecosystem. They may have plugins, though.