Callback server events

tittle is self explanatory, i want to know how to callback something from an event, to a client script, is it like this:

TriggerServerEvent("eventname", params, function (data)

end)

?

ignore this, i’ll just make the server event call a client event like i’ve been doing …
would be cool if it could work like the example, less events i would have create …

Why not make something that handles it automatically then??