Can someone EIL5 this for me. I don't understand how this works. If I have my computer on my home network and the person I was to share a file with is on their home network, how does this work out where it's sending the file/folder? The examples seem to suggest it magically knows based just on a passphrase. I have to be missing something. I'm aware this is a stupid question but I can't, based on what I've read so far, work out how this transfers stuff without more details.