RE: Bikeshedding go! Why is <M-f4> unbound?

[Drew Adams]

> A simpler solution is to dump the problem onto the user: setup
> a `w32-passthrough-events' where the user can specify events 
> that should be passed on to Windows's standard lib rather than
> handled by Emacs.

That would be good in any case: give users the option, no matter what the
default behavior is.

We also have `w32-register-hot-key', BTW:
(w32-register-hot-key [M-tab])

> But it still leaves open the question whether it should contain
> M-f4 or A-f4 (or use yet-another event representation), as well as 
> what happens when the user hits C-x M-f4.

And it still leaves open the question of the _default_ behavior for this key.
Just which keys should be included by default in user option
`w32-passthrough-events'?