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this is what i have learned from the very first informatic lession on in school, this was back in early ninetees.
in school we had computers with dos 6.22 as operating system and windows for workgroups 3.11 on top of it.
and noone ever claimed windows being an operating system until windows 95 arrived in august 1995.
and to be exact, staying for example on this particular early version 1.04 of windows.
who does memory allocation, managing ressources, and so on? dos does all the work.
windows 1.04 is not much more than file manager with gui, built in calculator, notepad.
that good old norton commander does the same in later versions, without having a gui.
and noone ever would call norton commander some kind of "operating system"...
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