What a waste of electrons this thread is!!
One person can't remember how it works, somebody else tries to remember what a book once told him, and you all have it wrong anyway. None of you could be bothered looking in a book, you just toss a bait into the ether and say "The theory is wrong because i can't understand it" and hope that Nick Lappos will write a page or two to remind you how slack you are.
Look in a book. And it's spelt Wagtendonk.
