Keeper of the Keys

[emrsing]

No: HPFGUIDX 113062

I have just finished re-reading the whole HP series for the 4th 
time.  And now that I have discovered HP4GU, the HP Lexicon, etc., am 
starting again with a more "critical" reading.  One question that 
comes up for me that I haven't seen addressed anywhere is, what is 
the significance of Hagrid's title being "Keeper of the Keys" and 
Grounds at Hogwarts.  The only KEY we have seen him carry (to the 
best of my memory) is the key to Harry's vault at Gringott's.  And he 
certainly held several key pieces of information that Harry, 
Hermione, and Ron used in solving the mysteries in SS.  But, is there 
some significance beyond this?  After all, Dumbledore did say that he 
would trust Hagrid with his life.  Does he perhaps hold the key to 
the whole mystery?  Any thoughts or theories out there?

"emrsing"