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I can prove whether or not this is true and will do so when I get a chance. I don't know, but I would hope that if the two machines are on the same LAN then Teamviewer uses a local LAN connection. I know that NAT traversal, however TV does it, might be some sort of issue, but I think I have ruled that out in this case.
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I'm not going to open any ports to the outside world that can be attacked when I'm not looking. I have no way to test this conjecture, but a look by TV developers should be instructive. I suggest that Mouse / KB polling in TMViewer does not work for games. I think the problem is that games poll mouse / KB at high speed and all other apps deal with events. I'm suggesting that folks at TMViewer need to test TMViewer with a game and find that the mouse / KB handing is not suitable for controlling games. In that case, my game traffic is either local or remote, but the problem is that TV acts the same when controlling the remote game.
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The behaviour of TMViewer is the same whether I'm using this LAN setup or going to a remote system - helping a friend for example. I'm running a private server, so any WAN based Teamviewer traffic is not interfereing with the game traffic, which is going over my 1GB LAN connections. However, My game connection is between systems on my LAN.
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