Television viewers interacting with second screens has become a common sight in the modern living room. Such activities are a mixture of related, semi-related, and non-related browsing of content. This growing trend is revolutionising the way that broadcasters think about their content. Through the envisioned connected home, driven by end-to-end IP connected networks, television content creators and app developers are now considering the design space for multi-device, interactive experiences. In this review paper, we consider the pre-digital beginnings of such scenarios, and progress to discuss how the introduction of mobile devices has affected the TV viewing experience. We discuss dual-screen usage over a variety of contexts in the connected home, with a focus on 'designed' dual-screen experiences such as companion applications. We conclude with reflections on the future of this area so that app developers, broadcasters, and academics may push further the space and improve future dual-and multi-screen experiences.