Using the NFC Listener
Mifare classic 1K stickers are known to work.
Writing a token to a Tag
You need to write the required user token as text to a RFID/NFC tag. For example if the login URL is http://localhost:8081/user/bert/login then bert is written to the tag.
Using on Windows
Install the reader drivers as required.
The GoToTags Windows App can be used to write the text.
The NFC listener is available as an Windows exe (currently GpiiUserListener110.exe). Once this is launched the status window can be displayed by clicking on the icon in the Windows notification tray and selecting "show window".
The user Listener
See User Listener.