[h-e-w] Using thinkpad keys in Emacs for windows

[Amnon Harel]

Hello,

I've just started using Emacs for windows on my thinkpad
(Lenovo laptop, formerly IBM). I'd like to map the thinkpad
"browser forward" and "browser back" keys to useful emacs
commands.
This actually works for my in Linux (Ubuntu, running under
virtual box) - I could identify the keys with xev, map
them in my .Xmodmap:
    keycode 233 = F21
    keycode 234 = F22
and then use them in emacs as usual.

I've tried the XKeymacs utility, which when I played with
the config GUI, cause emacs to realize the browser button
was pressed. But it did not let me map this to a key press
(I think), so I'm not sure whether it can do the job.
Also not sure how to have it active on all emacs windows
and no others. A usage almost the exact opposite of that
intended by the author :-)

Any suggestion?
In particular, how can I tell whether emacs for windows notices a key
was pressed (like xev does in linux)?

 Thanks,
 Amnon