One small thing, which I don't have on hand - the other night, I switched on the network monitor and saw an exchange I'd never seen before: ARKIV (my computer) sent an ARP packet to Jingping's computer, which is on the same local network - immediately, her computer responded with two UDP skype packets. ARKIV's skype was turned off. Is skype constantly checking incoming messages to see if they come from an address in its routing tables - in that case why was Jingping the only computer that got an ARP packet? Was the ARP packet sent by some active skype process? Mysteries, mysteries...
(These conversations suggest that skype knows enough to adjust its routing for LANs - so instead of IP addresses it needs to be routing to MAC addresses, or something.)
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