Despite formidable handicaps, the office of UN Secretary General and the Secretariat exercise continuing policy functions that come as close as anything conceived to a central point for responding to global interests. Recent incumbents such as Boutros Boutros-Ghali and Kofi Annan have had a profound political impact on the global stage. This book explains the history, structure, functions and the future challenges faced by the institution at the heart of the UN. Written by a world authority on the subject, this is the ideal introduction for students of the UN, international organizations and global governance.