I suspect (but should stress that I don't know, my suspicions are based purely on name and the fact that it's listed on the CERN Engineering Software DB) that the software in question is Allegro AMS Simulator: http://www.cadence.com/products/pcb/ams_simulator/pages/defa....
"Another factor that was attractive was the fact that a single network license allows CERN to run a COMSOL job on any number of cores or a compute cluster."
True, that could well be the software they're refering to. The reason I suspected that it may be Allegro AMS Simulator was a combination of it being listed on the CERN Engineering Software DB[1] and the product name.
Yeah, I would imagine CERN uses a lot of different packages. Indeed, they'd probably be mad not to run serious simulations across multiple systems to sanity check.. :)