drupal_install_system in includes/install.inc
Installs the system module.
module_enable in includes/module.inc
Enables or installs a given list of modules.
system_install in modules/system/system.install
Implements hook_install().
system_requirements in modules/system/system.install
Implements hook_requirements().
update_get_update_function_list in includes/update.inc
Returns an organized list of update functions for a set of modules.
update_get_update_list in includes/update.inc
Returns a list of all the pending database updates.