Yes or no? This is for story purposes, only. I'm not interested in the exact steps someone would take to do this, honestly, just can it be done? It's briefly mentioned, but is it realistic. Obviously, how would the first OS ever have been made if not from scratch? I remember discussing it with someone years ago and they said if you built your own computer you'd have to get a mainstream OS. They made it sound like you couldn't build your own OS from scratch. That had me wondering, then how on Earth was DOS, Windows, and Apple's OS first created if not from scratch. I remember watching videos about how the first computer (calculator) was an archaic analog system of gears and levers. Would a handcrafted OS be compatible with the worldwide web of today or would a mainstream OS be required to get someone online? I know that the internet started out as a tool for the military called the ARPANET (if my facts are wrong feel free to correct me). I know there isn't one main hub or headquarters where the internet is set up, but it's a communal entity. If my question is naive it's because my understanding of technology is naive. I should probably read more about the history of the internet and computers as we know them today, but this is a good place to start. Writing forums are a tool that should be utilized, but not the end all be all of the story's research.