The ENACTS Infrastructure Co-operation Network brings together 14 European organisations representing High Performance Computing centres and their users. Participants are drawn from across Europe and represent both traditional centres and smaller start-up centres. They also represent users of different classes of computers, from supercomputers to networked PCs. Through the Study Projects they undertake and through their General Meetings, they will work towards a European “Virtual Infrastructure” for all users of HPC. The broad spread of participants ensures that their findings will be relevant to all users and providers of services to the scientific computing community.