The demo linked here would surely look impossible.
One computer, WHILE IT WORKS, is multiplied into 3 computers which continue to work, each of them. This feat is done without any higher control and there are never conflicts which appear. All computers work asynchronously (mimicked here by randomness). Moreover, eventually they arrive to read and write on the same tape.
There are no calls, nothing you have seen before.Everything is local, no matter how you slice it into separated parts.