"The Mac system does execute screen snap-shops"
Windows does too with Alt-Print Screen. Then a Ctrl-V to paste into any document or into a Paint program. Paint Shop Pro allows one to actually define an area inside a window to copy.
Anyway - Print Screen takes a snapshot of the entire Windows Desktop which is then captured to the clipboard and Ctrl-V to paste. Alt-Print Screen takes a snapshot of a Window. The clipboard can be accessed with Start -> Run -> clipbrd
I was ecstatic when Borland/Word Perfect/Microsoft/etc switched over from the shift-insert crap and went to the MAC standard equivalent of Ctrl-Z, Ctrl-X, Ctrl-C and Ctrl-V