How it works
01
Download the deck for this computer.
02
Install it — it sits quietly in the menu bar.
03
Pair from your phone — Profile › Deck Listeners › +, scan the code.
 
Green light both sides — scans fill the guest form on their own.
Deck

The other half.

Unsigned for now — macOS: right-click › Open.
Windows: More info › Run anyway.