Tomorrow the plan is to add a new websocket-based way of making sure that only one copy of rss.chat is running at the same time. When you log on, on another computer or even on the same computer, this creates another copy of appPrefs.
If you change something, they get saved to the server. Meanwhile on another machine it doesn't have the new version, it has values that you don't want to write over the ones you changed on the other machine.
So when you log on, the server sends a "goodnightkiss" message to every copy it's connected to with your username. They then put up a dialog saying if you want to continue using rss.chat you have to reload.
All this is working in WordLand and FeedLand, so it's pretty likely it'll work right away. I know that sounds cocky, but that's how it's been going. It's like Claude is both a compiler and runtime, and I haven't seen any mistakes go by it without it catching them.