JoJo said:
When I click (Alt + PrtSc) a snapshot is taken of my computer screen.
The content of the snapshot must be saved somewhere on my computer
* Where, on my computer, are these snapshots stored ?
In the clipboard, which exists in memory, rather than on a disk drive
somewhere.
Here's my standard post on this subject:
Back in the days of DOS, the PrintScrn key used to print the screen. But in
all versions of Windows, this works differently, and the name of the key is
now an anachronism.
To use the key, press it to capture an image of the entire screen, or press
alt-PrintScrn to capture an image of the active window. Either one captures
the image to the Windows clipboard. Once it's in the clipboard you can paste
(Ctrl-V) it into any application that supports graphics (Windows Paint,
other graphics programs, even your favorite word processor). You can edit or
add to the image as you wish, then print it.
This ability to manipulate the image in a program before printing it is an
improvement over the original DOS method of just printing it. But if you'd
like that old facility back, there are several third-party
freeware/shareware programs that can do this, such as PrintKey2000 at
http://www.sharewarejunkies.com/00zwd2/printkey2000.htm