Administrative control usually refers to control over resources in an organization that is wielded by a manager. This source of this control is authority vested the position held by the manager. For example, the finance manager has administrative control over financial matters. There has to be a letter if appountment signed by the managing director or his representative appointing the said manager.
To activate the control, the said manager can either issue written directives, have his decisions recorded in minutes of meetings or just announce his decisions.