\_ Where do I find how to re-enable the otherwise useless "Windows" key to 

a) [for boos and hisses]: use windows
b) generically, play with xmodmap [*]
c) see the previously bounced link.

[*] xmodmap is kind of a pain to figure out how to use properly, and
may not be portable from keyboard to keyboard.  OTOH, I've got one of
the windows keys mapped to mod4 and the other to mod5.  That's right
nice. 

The only thing that I haven't foun xmodmap able to do is to map a key
('a') to the mouse button(s).

David