It's not a machine, General. It's... Putting it simply, it's just an ability some people have in the world he came from.

_{[And it's pretty damn awesome to use, too! Except he'd rather keep his heart, so he's not even going to try learning how to create those spiffy corridors.]}

Different worlds have different methods of transportation. _{[A beat.]} I don't know the full details of it myself so it'd be a waste of breath to ask me how it worked, I'm afraid.