Yes, I feel that there must be an internal floo system at Hogarts with a great deal of restictions!  Special floo powder, only teachers, not linked externally, invite only as mentioned below...After all, why wouldn't Sirius just floo into the Gryff common room?  Although, how *does* Sirius do the head in the fireplace thing?  Clearly it's not the same,but he wasn't even within Hogwarts!  Must be quite complicated & hope we learn more & see more interesting uses...
Vicky/Kitty

> >  
> > > Clearly, they can travel by floo!  In PoA Snape calls Lupin to 
> his 
> > office via floo powder.  Since most every room has a fireplace, 
> this 
> > would be pretty good way to get around> 
> 
> I doubt we'll see a whole lot of travel by Floo Powder at Hogwarts.  
> It would defeat the whole purpose of having passwords for access to 
> common rooms.  And imagine the security concerns if 
> students could just Floo out of the school straight to Hogsmead 
> Hogwarts is probably not connected to the Floo 
> Network.
> 
> BTW, has anyone ever figured out how that "head in the fireplace" 
> business Is that Floo 
> powder, or a charm, or a potion, or a form of apparating, or what 
> exactly?
> 
> 


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