cron.php in drupal-6.x/cron.php

Handles incoming requests to fire off regularly-scheduled tasks (cron jobs).

drupal_bootstrap in drupal-6.x/includes/bootstrap.inc

A string describing a phase of Drupal to load. Each phase adds to the previous one, so invoking a later phase automatically runs the earlier phases too. The most important usage is that if you want to access the Drupal database from a script without…

drupal_install_system in drupal-6.x/includes/install.inc

Callback to install the system module.

index.php in drupal-6.x/index.php

The PHP page that serves all page requests on a Drupal installation.

install_tasks in drupal-6.x/install.php

Tasks performed after the database is initialized.

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