Thanks, I will look at the TSRs, and I see plenty of them on my system. But yes, I do regular cleanups with various freeware utilities, so that a messy disk is not a problem, but memory could very well be, as you suggest.
Still, going back to my dream PC operating system, I should be able to run multiple sessions, under the same or different logins, on the same single screen, and from the single keyboard, as I have been doing for how many years or decades on a Solaris workstation. Why, I could do that on a VMS workstation 20 years ago. Inability to do this kind of multisession interaction with Windows is the reason why I still use my laptop’s 15.6’’ screen and can’t see a good excuse to upgrade to a larger attached monitor.
Of course, I don't run Windows.