I'm not sure how you concluded this from what I said, and I'm not sure
where the topic of Drag and Drop comes in ... but, let's try again.
Yes, you can "drag and then drop" the icon for a file from a CD to a
folder which represents your hard disk.
It has nothing to do with icons on your desktop.
If you "drag" files from the CD to your desktop they will go (guess
where?) ... the desktop. The desktop is simply yet another folder in
your profile (you can see it if you right-mouse click the start button
and "explore".
you asked what the function of the icons on the desktop are. the
traditional function is to launch programs for which thse icons's are
short-cuts.
I suggest you read the "Windows Basic" article which is on the first
screen "help" system. I also urge you to simply try to do what it is
what you want to do.