Just like with other accessories (such as the WiZmote or the PIR motion sensor), setup is only required once. As soon as one of the owners of the home has finished setting up one NFC tag, all other users can scan it to trigger the associated action, without having to redo any setup themselves.

As usual, members of the home will be allowed to control lights based on their access rights, for example guest users will not be able to control lights which aren't on the same Wi-Fi network as they are.