The old desktop officially has a name. It's Methuselah. I kept calling it so all day and so when, in the course of the install it asked for the name of the computer for ease of finding in networks, it may have stuck. So it's officially Methuselah. I also happily found some old
photographs that I'd thought I'd lost the originals of buried in the back of it's brain, for which I was immensely pleased. :) In theory, I only have about 13 minutes left of said install, though I think it might be lying. Not doing too bad, I guess. It's only been going for about an hour now. Whee!