drupal_required_modules() Returns an array of modules required by core. File
API for loading and interacting with Drupal modules. File core/includes/module.inc
system_list_reset() Resets all
system_register($type, $name, $uri) Registers an extension in runtime registries for execution.
module_set_weight($module, $weight) Sets weight of a particular module. The
system_list($type) Builds a list of installed themes. Parameters
module_config_sort($data) Sorts the configured list of enabled modules. The
module_load_install($module) Loads a module's installation hooks. Parameters
module_load_include($type, $module, $name = NULL) Loads a module include file. Examples: