http://blogs.msdn.com/b/windowssdk/archive/2009/10/12/win-sdk-hidden-gems-function-discovery-browser-fdbrowser-exe.aspxThe Function Discovery API, introduced in Vista, serves as an abstraction layer between applications and devices. This API allows applications to discover devices by function rather than lower level details such as bus or connection type. The Functionen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)