source code: WP_INSTALLING vs. WP_SETUP_CONFIG in setup-config.php

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I am trying to make sense of the wordpress installation process.
The file setup-config.php under wp-admin has the following.
I want to know what the difference is between these two variables,
why both are needed, and what exactly the WP_SETUP_CONFIG boolean
indicates.

/**
 * We are installing.
 */
define('WP_INSTALLING', true);

/**
 * We are blissfully unaware of anything.
 */
define('WP_SETUP_CONFIG', true);

When I do a search in Aptana with CTRL-H I can see that WP_INSTALLING is
referebced in quite a few files and WP_SETUP_CONFIG in just a few. What
does we are blissfully unaware of anything mean? That we don’t have a
wp-config.php file or what?

Thanks.

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