We discuss some of the main open issues related to the light-up and evolution
of the first accreting sources powering high redshift luminous quasars. We
discuss the perspectives of future deep X-ray surveys with the International
X-ray Observatory and possible synergies with the Wide Field X-ray Telescope.Comment: 6 pages, 6 figures. Proceedings of "The Wide Field X-ray Telescope
Workshop", held in Bologna, Italy, Nov. 25-26 2009. To appear in Memorie
della Societ\`a Astronomica Italiana 2010 (arXiv:1010.5889
