A Manager

1. (management) A person whose job is to manage something, such as a business, a restaurant, or a sports team. Synonyms: administrator, boss, chief, controller, comptroller, foreman, head, head man, overseer, organizer, superintendent, supervisor
2. (baseball) The head coach.
3. (music) An administrator, for a singer or group.
4. (computer software) A window or application whose purpose is to give the user the control over some aspect of the system