Floo and GP (was Savior complex? / The Stone)

[delwynmarch]

No: HPFGUIDX 110877

Pippin wrote :
"BTW, I really don't think Harry could have flooed to Grimmauld Place.
IIRC, we never see anyone use the GP fireplace for transport, only
communication. Surely we'd have seen people flooing to and from the
ministry and St. Mungo's if it were possible."

Del replies :
IIRC we don't see *anyone else* but Harry using the fireplace in GP
for *anything*, so we can't really conclude whether this fireplace is
a communication-only fireplace or not.

That reminds me of another thing that puzzled me : if Harry can use
the fireplace in GP, that means that fireplace is still connected to
the Floo Network, right ? How does that tie in with the high level of
security the Order has put on and around GP ? In particular, I'm
wondering what the people monitoring the Floo network see at the place
where GP should be, if they see anything at all ? Can you make a place
Floo-unplottable ? And also : if Umbridge had managed to get a grip on
Sirius's head, could she have gone back to GP with him, considering
that she's not in the Secret ?

Just wondering about the technicalities of the thing.

Del