I have a few ponderings on the mechanics of the Floo Networks. Can you be transported to any fireplace through the network, or does some kind of spell need to be cast in order to make it a 'Floo Stop'?

And if no spellis really need, what are the requirment for someone being able to transport by Floo? Does it need to be a fireplace? What if there isn't one anywhere close? Can a bon fire be used, a burning trash can, an oven?

I'm still wondering. What do all of you think?