I reviewed the docs for get_sidebar at:
http://codex.wordpress.org/Function_Reference/get_sidebar
They say to include more than one sidebar, I put in index.php something like:
...
<div id='left'>
<?php get_sidebar('left); ?>
</div>
<div id='right'>
<?php get_sidebar('right); ?>
</div>
...
Then, in my theme's folder, I have 2 files (identical in content) sidebar-left.php and sidebar-right.php.
In Dashboard/Appearance/Widgets there are now indeed 2 sidebars to widgetize.
However, when I visit my site, the same sidebar shows up on both sides.
What could I be doing wrong? IS there another file in my themes that I need to alter?