On the Importance of Having an Identity or, is Consensus really   Universal?
  We show that Naming-- the existence of distinct IDs known to all-- is a hidden but necessary assumption of Herlihy's universality result for Consensus. We then show in a very precise sense that Naming is harder than Consensus and bring to the surface some important differences existing between popular shared memory models. 
Harry Buhrman (CWI), Alessandro Panconesi (Univ. La Sapienza, Rome),   Riccardo Silvestri (Univ. La Sapienza, Rome), and Pau...