As for any activity in the society of the XXI century, international collaboration is very important also for the DCH preservation. The European Commission i heavily investing through its Programmes e-Infra and Area considered as one of the key enablers of the European Research (ERA), At the top of the three-layer model of an e-Infrastructure there is the most important "network': the human collaboration between scientific communities of researchers. This approach is planned to be maintained also in Horizon 2020, the new program of the European Commission for the research and innovation in 2014-2020. The European Network (GEANT and the pan-European Grid are flagship initiatives that need to be taken into account also by the DCH sector