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We will briefly discuss the importance of sensitive X-ray observations abovea few tens of keV for a better understanding of the physical mechanismsassociated to the Supermassive Black Hole primary emission in both radio quietand radio loud AGN and to the cosmological evolution of the most obscuredsources.Comment: 8 pages, 3 figures. Invited talk at the meeting "Gamma Wave 2005",  Bonifacio, September 2005. To be published in "Experimental Astronomy

Rolling down from the 30 keV peak: Modelling the Hard X-Ray and γ-Ray Backgrounds