Just an update on the Metakey situation: I got them working!  

If I had looked more closely at the output of 'xmodmap -pk', I would have
seen that, by default, the left Alt key doubles and the left Meta key and
the right Alt key doubles as the right Meta key.  Once I removed the Meta
mappings for the Alts, I then assigned them to the Windows keys and now all
is well.

For those interested, I now feed xmodmap a file containing:

keycode 64 = Alt_L
keycode 113 = Alt_R
keycode 115 = Meta_L
keycode 116 = Meta_R

Gabe
-- 
Gabe Turner                                             gabe at msi.umn.edu
SGI Origin Systems Administrator,
University of Minnesota Supercomputing Institute
 for Digital Simulation and Advanced Computation         www.msi.umn.edu