Using fn-Key of IBM Thinkpads in X?

[Christian Walther]

Hi,

I'm currently using the latest FreeBSD 6.1 patchlevel on an IBM
Thinkpad T23, and so far I'm quite happy with it. (I'll have an issue
with my ath-based WLAN-NIC, but I've to address this later.)
One thing I'm wondering about is if it is possible to use the fn-Key
as another special key in X, e.g. like Control or Alt. I'm using ion3
as a window manager, and I found know hotkey configuration that
wouldn't affect the usage of hotkeys in applications. Using
fn+<something else> with X/ion3 would be nice.
But I don't know if fn sends a scan code like the other keys do, and
how I could map this key in X.

Any help would be greatly appreciated.

Regards
Christian