It's not just link, it's also integrate and not effect performance and UX. Many of these apps are mobile & cross platform and have things like message sending

It's not just link, it's also integrate and not effect performance and UX. Many of these apps are mobile & cross platform and have things like message sending to clients you've never connected to. Messages getting restored by the server if you re-install the client. Push notifications by another server, saved history and so on. Could it be done in a hackathon night?