Dumbledore in CoS was Re: The Keeper of the Keys.

[M.Clifford]

No: HPFGUIDX 113499


> Yonna:
> > So with this bit of information I would say yes. Parseltongue is 
> > required to open the Cos sink entrance and the serpent door 
below. If not, anyone could simply open the CoS and not the "only" 
the true heir to Slytherin.
> 
> SSSusan:
> But Harry *isn't* the Heir of Slytherin.  So I guess what Harry 
was doing was opening the Chamber, whereas Tom unsealed it.  At 
least that's the only way it makes sense to me.  I asked in another 
post what would have happened if Harry had happened into Myrtle's 
> bathroom *before* Diary!Tom unsealed the Chamber and had happened 
to hiss "Open it" to the faucet in Parseltongue.  Presumably, since 
he *isn't* the Heir of Slytherin, the sink would not have budged?
> 
> Siriusly Snapey Susan

Valky:
Or that, as pippin has suggested, Tom was plotting and orchestrating 
Harry's entrance to the Chamber using Ginny before he took her into 
the chamber. 

I daresay that Tom, given that he is Slytherin and the alter ego of 
Lord Voldemort evil plotter of the century, wasn't wasting his time 
in Hogwarts chasing relatively insignificant individuals on a 
disorganised killing spree. He plotted and prepared for the new rise 
of Voldemort, surely. At the very least he created a secret entrance 
to Hogwarts of his own via the fourth floor secret passage to 
Hogsmeade. 

So when Harry opened the chamber using Parselmouth the *true* heir 
of Slytherin was simply permitting Harry to believe that he was in 
control and was sneaking up on his enemy. When clearly he was not. 
And the only reason Harry's parselmouth worked on the Chamber 
entrance is that Tom allowed it to do so to facilitate luring Harry.