| db_installer_object | Returns a database installer object. |
| db_run_tasks | Ensures the environment for a Drupal database on a predefined connection. |
| drupal_check_module | Check a module's requirements. |
| drupal_check_profile | Check an install profile's requirements. |
| drupal_detect_baseurl | Auto detect the base_url with PHP predefined variables. |
| drupal_detect_database_types | Detect all supported databases that are compiled into PHP. |
| drupal_get_database_types | Return all supported database installer objects that are compiled into PHP. |
| drupal_get_installed_schema_version | Returns the currently installed schema version for a module. |
| drupal_get_schema_versions | Returns an array of available schema versions for a module. |
| drupal_install_fix_file | Attempt to fix file permissions. |
| drupal_install_mkdir | Create a directory with specified permissions. |
| drupal_install_profile_distribution_name | Loads the install profile, extracting its defined distribution name. |
| drupal_install_system | Callback to install the system module. |
| drupal_load_updates | Initialize the update system by loading all installed module's .install files. |
| drupal_requirements_severity | Extract highest severity from requirements array. |
| drupal_rewrite_settings | Replace values in settings.php with values in the submitted array. |
| drupal_set_installed_schema_version | Update the installed version information for a module. |
| drupal_uninstall_modules | Uninstalls a given list of modules. |
| drupal_verify_install_file | Verify the state of the specified file. |
| drupal_verify_profile | Verify an install profile for installation. |
| install_goto | Send the user to a different installer page. |
| install_profile_info | Retrieve info about an install profile from its .info file. |
| st | Functional equivalent of t(), used when some systems are not available. |
