By the way, I am not debating whether or not applications retain some trace of memory if the are closed in Windows - they may or may not, and that affects some folks, then I wish them the best of being aware of this and that they can do what they need to for mitigating any adverse effects.
I DID go back and look into TSR programs, as I was quite sure in my mind that they existed before Windows 3.1, and found the following entries without really any significant digging - just a quick Google search:
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From various Wickipedia entries:
In computers, a terminate and stay resident program (commonly referred to by the initialism TSR) is a computer program that uses a system call in DOS operating systems to return control of the computer to the operating system, as thougth the program has quit, but stays resident in computer memory so it can be reactivated by a hardware or software interrupt.[1] This technique partially overcame DOS operating systems' limitation of executing only one program, or task, at a time. TSR is unique to DOS and not used in Windows.
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1983
Borland developed a series of well-regarded software development tools. Its first product was Turbo Pascal in 1983, developed by Anders Hejlsberg (who later developed .NET and C# for Microsoft) and before Borland acquired the product sold in Scandinavia under the name of Compas Pascal. 1984 saw the launch of Borland Sidekick, a time organization, notebook, and calculator utility that was an early and popular terminate and stay resident program (TSR) for DOS operating systems.
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1983
Borland runs a two-page ad in Byte for Sidekick, a memory-resident, or Terminate and Stay Resident (TSR) program that uses a hot-key pop-up window to superimpose a calculator, calendar, notepad, phone dialer, and ASCII table onto PC DOS software.[150][151][152] Other companies soon discovered this wonderful DOS feature and TSRs began competing for the PC compatible's finite memory space. InfoWorld would name it 1984 Software Product of the Year (1-2-3 was their 1983 awardee).[136]"
So, in agreement with my fuzzy brain, it would seem that TSR did apply to DOS programs, and was first introduced with DOS programs, somewhere in or around 1984.
In any case, whatever the terminology or history, some programs do close completely in Windows, and some do not. Completely may or may not include some residual bit of memory - I do not know for sure one way or another, but whatever that amount may be, it does not affect my system, and never has affected any system I have ever used, in terms of causing any real problems for me.
Bob Bone