The ability to share your content wirelessly from your laptop or smart device greatly improves meeting efficiency. Whether you are sharing sales figures, training your service staff or brainstorming with peers, there is a wide range of presentation tools available that offer that possibility: from consumer to professional, and from a few bucks to thousands of dollars. They all, however, require a sender, a receiver, and — in between those two — a wireless communication protocol. In this series, we’ll take a closer look at the latter and review some of the most popular options. Today: the closed eco-systems of Apple AirPlay and Google Cast.