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

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

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

helper($helpers)

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

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

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

model($model[, $name = ''[, $db_conn = FALSE]])

get_package_paths([$include_base = TRUE])

is_loaded($class)