The Trilateral Euregio Cluster (TEC) is an agreement between the EURATOM-associations FZJ (Jülich, Germany), FOM (Nieuwegein, the Netherlands), ERM/KMS and SCK•CEN (Brussels and Mol, Belgium), coordinating the research on fusion energy in the EUREGIO of North Rhine-Westphalia, the Netherlands and Belgium. The current programme of collaborative research is mostly oriented towards Plasma-Wall Interaction studies, based on complementary experimental devices situated in the three laboratories. This collaborative agreement represents a significant part of the Fusion Research in Europe.