Hi, PCBruiser, and thank you for your answer.
As for IPV6 and such new standards, I follow your your reasoning completely. What's bothering me though, is that these 'connections' appeared overnight. On just one of my machines. With no changes to the configuration. Not made by me, anyway. The other system, also running WinXP and equally updated, shows no trace of these pseudo-interfaces when I run the command "ipconfig".
I'm most likely being paranoid, of course. But I would still like to somehow exclude the possibility of unauthorized tunneled network connections. If for nothing else, for my peace of mind. Could the difference somehow be related to some Microsoft update, in conjuction with the other system being an older socket A-system (Asus A7V600), possibly not capable of handling IPV6, and hence not displaying the same info when I run "ipconfig"?