If you mean that you expect that you could send the same updates to two players at the same time because of how broadcasting works, then I'm pretty sure you can't do it because the broadcast is only used to initially find the clients. After they're found (either by broadcast or by entering the IP/hostname manually), it uses TCP communications to send the data (I'm at least 99% sure of that).

If you meant something else, then just ignore me.
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Bitt Faulk