You can find the TK.wii object in the Eamir Sdk on www.eamir.net. You must be registered to download.
Tk.Wii is part of third parties used by the Sdk. You can try the objects of the Eamir Sdk, they work fine for the Wiimote+Nunchuk and you will understand how the Tk.wii works.
You can connect more than one Wii (I work on a project with 5, it Works).
The only problem is that it seems Tk.wii development is stopped and it misses some features like using more than one Ir track points,...