hook_user_login($account) The user just logged in. Parameters
hook_user_logout($account) The user just logged out. Parameters
hook_user_format_name_alter(&$name, $account) Alter the username that is displayed for a user.
hook_user_cancel($edit, $account, $method) Act on user account cancellations. This
hook_user_cancel_methods_alter(&$methods) Modify account cancellation methods. By