_install_select_profile(&$install_state) Determines the installation profile to use in the installer.

Run the task on each installation request that reaches it. This is primarily used by the Drupal installer for bootstrap-related tasks.

install_find_translations() Finds all .po files that are useful to the installer. Return

install_check_localization_server($uri) Checks if the localization server can be contacted.

Do not run the task during the current installation request. This can be used to skip running an installation task when certain conditions are

install_display_output($output, $install_state) Displays themed installer output and ends the page request

Run the task on each installation request until the database is set up. This is the default method for running tasks and should be used for

install_install_profile(&$install_state) Installs the install profile. Parameters

install_load_profile(&$install_state) Loads information about the chosen profile during installation.

install_import_translations(&$install_state) Imports languages via a batch process during installation