«Popper tackled an immense range of subjects: among them the mind-body problem. He was a dualist and more, a pluralist. He defined a third reality beyond the material world and the world of mental events, a World 3 consisting of the products and creations of the human mind, abstract and no longer in human minds - ideas, theories, music and poetry, Shakespeare's plays and the English language, not located in space or time but real because of their ability via human minds to change the face of the material world.»
So that's where computer programs live! In their uncompiled form, at least.