Think he's refering to the tilde (~) key. My keyboard does not have the § key or anything between Tab and 1 (they aren't on the same 'line').
That being said, if you have a Logitech keyboard, you can use SetPoint to remap the § key to, say, Shift+§, then map your Teamspeak to Shift+§. This way, when you press your § key, it sends Shift+§ and the game ignores it.