Just FYI, gsocket works fine with 10.6.8 and has no issues, apparently, with a lack of udp or using utdns.
It can do what tmate promised but did not deliver, being broken.
View attachment 2507556
Basically you can connect any two machines, as long as both have some connection to internet and you have access to install the program. (I replaced the image with something better looking than a dark photo of the screen LOL.)
Works either way (from powerpc mac to any modern system and reverse), no special network setup.