MuonCalibRunLumiBlockCoolSvc Node1 MuonCalibRunLumiBlockCoolSvc + MuonCalibRunLumiBlockCoolSvc() + ~MuonCalibRunLumiBlockCoolSvc() + queryInterface() + initialize() + finalize() + GetRunEventNumber() + interfaceID() Node2 AthService - AthService() - AthService() - operator=() Node2->Node1 Node3 AthCommonMsg< Service > + msg() + msg() + msgLvl() Node3->Node2 Node4 Service Node4->Node3