Sibling machine communication

[benjaminpreiss]

I want to enable communication between sibling machines in a system of machines, where the machines run in parallel.

As the docs are relatively sparse on the topic, I am not sure how to model state systems and how child machines can communicate with each other.
Nevertheless, I have now created a sandbox where the child machines are children of a parallel type root machine.
The authentication machine should then send a signal to the data loader machine once the authentication is loaded, so that the data loader machine can start loading data

I am trying to achieve this functionality by calling raise() on entry of the authenticated state. But it seems that the data loader machine does not receive this signal.

Here is the repro: https://codesandbox.io/p/devbox/zen-https-x8trsl?file=%2Fsrc%2FApp.svelte%3A4%2C63

I am super glad for a hint or correct code example... And additionally maybe an explanation on how systems can help in the matter!

Edit
Most specifically I want to send and event to every sibling machine at once

[benjaminpreiss]

Using a different approach (namely, a system of machines) I am able to receive events on one of the children by sending the event to them directly:

sendTo(({ system }) => system.get("data"), {
      type: "AUTH_LOADED",
})

Updates codesandbox

I would prefer though to be able to send an event to every machine in a system, without explicitly naming them. Is that possible?

Edit:
Also, here another codesandbox that also features a RESET button for anyone looking for more examples