No operating system I know of, no matter how many gigabytes of memory you have, can remember more than one copied item at a time. That's ridiculous!
Maybe I'm misunderstanding the functionality he's talking about, but hasn't KDE's Klipper (http://userbase.kde.org/Klipper) and GNOME's Glipper (https://en.wikipedia.org/wiki/Glipper) solved this problem long ago? I'm sure there are other clipboard managers for other OS'es as well.
I think he means built-in to the OS. He probably uses something like the ones you mentioned, as he claims that the "only must-have app I need is a global clipboard history application."
Yeah, I had a similar reaction. I had been using the dual Office/VS clipboard ring since back in ~2002, but I forgot that it was only for applications with Office integration and not OS-wide.
He uses Windows so I assume he doesn't know much about Linux Distros. You're correct, Klipper was the first thing I thought of as well. I assume his OS experiences are: Mac, Windows, iOS, Android judging by his info posted.
Maybe I'm misunderstanding the functionality he's talking about, but hasn't KDE's Klipper (http://userbase.kde.org/Klipper) and GNOME's Glipper (https://en.wikipedia.org/wiki/Glipper) solved this problem long ago? I'm sure there are other clipboard managers for other OS'es as well.