|Since the implementatin of keyboards with the "Alt Gr" key to the right of the Space bar (in 2002?), that's the key to use on many keyboard settings.|
I assume you aren't using the US keyboard so you would have the @ as alternative on the top row 2 key, with " when shifted.
Mobo: Asus P7P55D LE
OS: Microsoft Windows 7 Professional OEM
CPU: Core i5 750 @ 2.67 GHz
RAM: Corsair Dominator DHX+ DDR3 1600MH 4GB
GPU: Sapphire 4870 D