I have read this page:
http://help.WebsiteBaker.org/pages/en/advanced-docu/designer-guide/creating-a-wb-template.php
It shows what you do in the info.php page to get multiple blocks, like this:
// definitions for multiple blocks (required if more than one block is used)
$block[1] = 'Main content';
$block[2] = 'News';
But what do you do in the index.php page?
I have seen this code: <?php page_content(); ?>
...so I'm guessing the answer uses something like this, but I can't find an example of what code you should use in index.php.