Think point 2.2 refered to :
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Windows 7 Sensor and Location .NET Interop Sample Library (Link Removed) The Sensor and Location .NET Interop Sample Library provides an abstraction of the native Sensor and Location API and strongly typed objects for specific sensors for its Sensor Data Report. For example, a light sensor has a strongly typed LightDataReport object. With the Sensor and Location .NET Interop Sample Library, you can create strongly-typed custom sensor objects as well as use the three built-in sensors: Accelerometer3D sensors, Light sensors, and Touch Array sensors. These sensors are part of the Windows 7 Sensor Development kit. This library also provides a unified location API that determines location. With the Location platform, you can use the same APIs regardless of the underlying technology that is providing data, such as GPS, Wi-Fi triangulation, or IP Resolver