It's not possible nor makes sense to forward the same port to multiple computers in the LAN. It doesn't make any sense for TCP. And it doesn't make sense for UDP either, in particular if you have "kids with different computers be able to host games online". 2 forwards would double the traffic. 3 forwards would be 3 times the traffic.

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Port Forwarding (in Diagnostics mode if you want to give it a whirl) allows you to forward TCP ports from your local machine to the remote one, or vice versa. At first this seems like quite a specialist feature – “hmm… maybe its for if there’s sometng you need to access on the remote machine and you have some kind of network client?”.