Manipulation in Potterverse and in general /Tigana spoilers

[Carol]

No: HPFGUIDX 185150

Pippin wrote:
<snip>
> --PS/SS ch17
> Well, we know that Harry's wrong: Dumbledore *doesn't* know about
everything that goes on at Hogwarts. Dark wizards can fool him,
everyone knows that.  The proof is that everyone knows what happened
in the dungeons in Book One,and no character that we know of thinks
that Dumbledore should have known Quirrell was possessed. That part of
the theory is full on tinfoil, IMO. 
<snip>

Carol responds:

I realize that your point is that DD probably didn't know that
Quirrell was possessed, a point I'm not sure about. (Snape had plenty
of chances to perform Legilimency on Quirrell without Voldemort, who
was looking out the *back* of Quirrell's head, seeing him do it. And
if snape knew, he'd tell LV.)

However, I'm actually responding to a side point here, your statement
that everyone knew what happened with Harry and Quirrell. True, DD
says that "the whole school knows," but what, exactly, did they know?
that Quirrell was trying to steal the Sorceror's/Philosopher's Stone?
They couldn't have known that LV was possessing Quirrell, or Percy,
among others, wouldn't have denied that he was back in OoP. They
couldn't have known exactly how Quirrell died, either. (If it happened
as it did in the film, people might have accused Harry of killing
Quirrell--in self-defense, of course.) The students in the Hog's Head
don't seem to have a clear idea of events in either Harry's first or
his second year, and the awarding of points for courage, clear
thinking in the face of danger, and the best-played game of chess in
many years in SS/PS don't provide much information.

What, I wonder, did Dumbledore tell the students and staff (other than
Snape, who would have been told the full truth and may have been there
when DD rescued Harry, since Harry says that he heard voices and DD
doesn't talk to himself)? We know that DD's idea of "everything" is
rather different from the reader's idea of everything! Anyone have any
ideas?

Carol, who needs to get back to her Christmas cards and finish her
Christmas shopping before the crowds make shopping an ordeal rather
than a pleasure