Not that there's anything wrong with your solution, but just for general
info...
Do you mean the marking on the actual key on your keyboard? If so, the F12
key by itself doesn't adjust the volume ‹ you need to use a modifier key
along with it. Which modifier key depends on what keyboard you have, but
that's determined by the keyboard design. On my MacBook Pro keyboard, for
example, volume is adjusted using F4 (decrease) & F5 (increase), but I need
to hold the fn key for them to do so.
The OS X default assignment for F12 by itself is to toggle the OS X
Dashboard. [I'm back on my MBP running Snow Leopard so I was able to confirm
the assignment.] That can be disabled or changed in System Preferences>
Expose & Spaces> Expose, which will enable Word to reclaim it for Save As
automatically.
Regards |:>)
Bob Jones
[MVP] Office:Mac