You can meaningfully recreate this world today for a personal, non-work environment. For a PC, what do you really need a persistent internet connection for? If you have a Mac, create a couple of network locations, one "Offline" (all internet-connected network adaptors disabled) and another "Online." Keep a habit of leaving it at the "Offline" unless you really need to go online for something. This is what we did thirty years ago with dial-up.