First of all, I am chemist, not an AI specialist, therefore my question may be naive. One can read a lot about the rapid development of AI-s not only in sci-fi novels. I wonder whether artificial intelligence "machines" communicate with each other? I have heard that many of them are programmed to communicate with humans. But what about inter-relations between AI-s? Has it been investigated systematically? Can they learn form each other? Do they use human language or do they develop an "own" communication system (which seems to be natural)? If yes, do we understand this communication? I appreciate the comments of experts.