I am actually looking for an instrument to practice with and the flute has caught my attention.

I have started by taking a look at the fingering charts and was surprised to note that certain notes, when they are played low on the staff or one octave higher, have the same fingering??? How can that be?
I checked out a few sites and this seems to be constant. For instance, if we go here:
http://www.dummies.com/how-to/content/b ... chart.html
we can easily see that the E's, F's, G's and A's are the same in both cases.
Is there a hidden key that isn't shown on these charts or is it something that the musician does differently with his mouth?
Please let me know.
Thanks.
Michael.
P.S.: I am sorry if this post ends up being there three times but everytime I hit "Submit" the system says that all is good but then in "View your posts" I always have nothing.