# Part 11 — realtime

The relay pokes; your existing socket layer delivers; the device pulls.

```ts
// server
onPoke: (evt) => {
  for (const memberId of evt.memberIds) {
    hub.send(memberId, { type: 'argala.poke', graphId: evt.graphIdFor(memberId) });
  }
};

// device
socket.on('argala.poke', ({ graphId }) => void engine.poke(graphId));
```

`poke` is a no-op for a graph this device is not following, so it is safe to
fan out.

Without a socket layer, `engine.startAutoSync(15_000)` is sufficient for most
apps — writes push within `pushDebounceMs` regardless, so the
interval only governs how fast you see other people's work.

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