Keystrokes Aquamacs doesn't capture?

How do I set a keystroke so that Aquamacs doesn't handle it, but passes 
it up?
For instance, on my system,
^F4
is handled by OS X (whatever handles window management), not by Aquamacs.
On the other hand,
Ctr-`
is handled by Aquamacs. Even though it's not bound to any function, it's 
still
handled by Aquamacs (for instance, Aquamacs will report in the 
minibuffer that
Ctr-` is not defined if I press it while Aquamacs has focus).

So if I assigned a system wide keyboard shortcut for Ctr-` it wouldn't 
work for
Aquamacs. Is there a way to get Aquamacs to stop capturing Ctr-`?


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