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RE: Can messenger use the LAN for comms when users are on the same LAN?
If you are on the same LAN, it doesn't already go through servers (at least for voice or video conversations, and viewing webcams, I don't have any idea for only text messaging.). I confirmed this months ago by checking the ADSL modem's leds while making voice, video conversations with my friend on Messenger. There was only LAN access, but there wasn't an internet activitiy while we're talking (so it doesn't slow down your normal download or upload speed)
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