Identifer: core.acp_user_add
Location: includes/acp_users.php
Parameters: 'id', 'mode', 'username', 'user_id', 'trigger_override'
Explanation: To be able to add a new user in user management. About line 99
See http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=46205&p=269803#p269803