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Published online by Cambridge University Press: 25 May 2016
What causes the differences in the central engines of AGN? Are they intrinsically different or are the differences entirely due to environment and orientation? We have postulated that there is basically only one engine, consisting of a black hole and a closely coupled (even symbiotic) jet/disk system with very similar parameters in all AGN. This has lead to interesting results concerning the modelling of the UV/radio correlations of quasars and the difference between FRI and FRII radio galaxies.