you can read more about this tool here: http://www.cernlove.org/blog/2009/12/im-down-with-op-v/
picture of OP Vistars' operation during the energy record of the LHC's Twin Beams: http://mediaarchive.cern.ch/MediaArchive/Photo/Public/2009/0... (from: http://cdsweb.cern.ch/record/1225474)