Shoutbox

I'm not sure if this is possible but i really need it so im gonna ask anyways...

Is there anyway to make your computer think it's connected via LAN to another computer but have it connected over the internet?

For an example on gamecubes or xboxes you could play some LAN-only games online making the machines think they are connected via LAN ... now i know of a program that does this gor GC (warppipe) but it doesnt seem to work without a gc stuck to the computer

any ideas on how i could manage this?