in notedeck we will have app handlers that will open the right app for certain links. right now we only have one app in notedeck (the columns app) but we are adding dms, relay chat, visualizer. eventually live streaming, etc. these will all exist as apps within the notedeck browser/os. they all talk to the local in-process relay which you can use for cross-app communication. this means everything that is a notedeck app is offline-first by default.