Seeing that multiple TTYs exist on FreeBSD and Darwin, and they provide the core of macOS and iOS, how would I access such TTYs? And would they be multiple instances of GUIs or would they involve terminals? I would very much prefer for there to be an environment similar to FreeBSD for testing purposes.
Please enlighten me as to whether or not such environments exist (or can exist) on Apple's OSes. I am interested in whether or not I can create one as a proof-of-concept, whether it can be on iOS 13 beta, iOS 5, macOS Mojave, or macOS Snow Leopard.