That's a truly #retro take on modern communication: "Conduit installer" means that there's a component on a PC that fetches updates from the Fediverse and syncs them to the PalmOS device when it's physically connected, together with syncing back (and publishing) any replies written offline since the last sync.
And it's not just retro, it should also be a rather effective dopamine regulator: You get to read the Fediverse more like a newspaper, instead of being shown something that resembles a 24/7 cable news feed.