The United Nations Charter describes the Secretary General as the "chief administrative officer" of the Organization. The Secretary General is fully responsible for all the administrative tasks, public relations tasks and holds the responsibility to monitor all operations.
A delegate in a Model United Nations conference is a participant who represents a country other than their country of origin and deliberate on issues from the country's perspective, and not from the delegate's perspective or point of view.
A Chairperson is a designated staff member responsible for the overall supervision of the Council/Committee they have been appointed to. Chairs are responsible for the preparation of the Study Guides, for the correction of the delegates’ Position Papers and for facilitating delegates’ preparation in general
A Page is a designated staff member responsible managing papers of a body or committee and consequently helps to move those said papers around to other bodies or committees.