Location devices make up one especially interesting category. By now, most people are familiar with global positioning systems (GPS). In Windows, a GPS sensor is part of the Location category. The Location category could include other sensor types. Some of these sensor types are software based, such as an IP resolver that provides location information based on an Internet address, a mobile phone tower triangulator that determines location based on nearby towers, or a Wi-Fi network location provider that reads location information from the connected wireless network hub.