What does this button on my keyboard do?

There is a button on my computer keyboard; at the top-left of the numeric keypad, just below the reduce-volume button; it's like a parallelogram with a big cross (X) through it. - What does this button do? - I can't seem to find a use for it.
Also, while we're talking buttons, the buttons above the arrow keys seem to correspond to Home, End, Page Up, and Page Down on PC's, but they seem (annoyingly) to perform slightly different functions. - Any explanations?
And finally, I know you can get a hash symbol using various modifier-key combinations, but it's so much simpler on a PC when you can see it above the 3 number. (Especially on a music computer when you need it frequently as the sharp sign).

I've found it interesting to learn that on some Apple keyboards, the button in question has the word "clear" marked on it (and nothing else).
My button doesn't have 'clear' on it, or any words, just this symbol of a crossed-out parallelogram. (It's in exactly the same place as the 'clear' key, but performs no delete function that I can tell).
I can't find a good picture, but you can sort of make it out here:
http://homepage.mac.com/noodlenick/GarageSaleImages/GarageSale_116276558123051.jpg
Doesn't anyone know what it does?

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