[framesaver]

When they say 'trade', they mean actually burning a CD an posting it to someone else in exchange for a different CD posted in the opposite direction.

damienricetrading.tk and the like just speed up the process by 'seeding' the show to more people who will go on to trade it with others.

That said, you can on rare occasions 'trade' digitally, where one person sets up a server on their computer, and the other downloads one show from it, while uploading another.

But in most cases where you hear people talking about trading, it involves the exchange of long lists of shows via email and good old-fashioned bubblewrap-padded envelopes in the post.