I would prefer one for a private local home network....preferably free.
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What I really want it is for IM other computers in my home network.
AIM sounds good.
I would prefer wireless....smoke signals are pretty good but can you lose the signals with high winds.They have this new system out that is tethered with twine and soup cans at the end. You have to pull really really tight so make sure there are no obstacles in the network. You might have to setup an VPN.