Yes, the first link there Troll, thanks. Gee, I thought most of you guys were better informed. My bad.
Seriously it's a pc to pc "phone" connection. I think MSN messgr. had it(has it) or something similar. It always seemed shitty nad would drop you frequently. This one is the diggety! You can do pc to phone too, for like .03 a minute I think. But like I said, pc to pc, it's free, and da bomb if you have relatives or friends in far away places!