What referenz is used in this Tutorial?

Hello,

in the Video
Creating a Managed Bluetooth Application Using Microsoft Visual Studio 2005
http://msdn.microsoft.com/mobility/windowsmobile/howto/ehowtos/default.aspx

it is showen how easy it is to use Bluetooth. But when I start to build a WM05 Application in VS2005 I don’t have bluetooth. What Library do I need or what Referenz do I have to add to build the same Application like the one showen in the Video

Thank you

twickl