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Microsoft tries to convince Windows 10 users to buy a new PC with full-screen prompts
(www.theverge.com)
This is a most excellent place for technology news and articles.
PC = a computer that you use to do computer stuff on. Windows PC, Linux PC, MacBook or a Chromebook, it's all PC.
I use cloud computing to run a lot of my computer stuff. Not a PC. I self-host some services on a home-server. Also not a PC. I can install a GUI on these if I want and RDP into them, still doesn’t make these PCs.
I can use my personal laptop as a server if I want (and I have!) with remote-access enabled; so it is both a PC and a not-PC?
I think we have to settle on PC being usecase-driven; not hardware-defined. Which is what I think you were trying to get at, but abstracting too far.