add_package_path($path[, $view_cascade = TRUE])

file($path[, $return = FALSE])

language($files[, $lang = ''])

view($view[, $vars = array()[, return = FALSE]])

helper($helpers)

dbutil([$db = NULL[, $return = FALSE]])

database([$params = ''[, $return = FALSE[, $query_builder = NULL]]])

get_package_paths([$include_base = TRUE])

driver($library[, $params = NULL[, $object_name]])

is_loaded($class)