Besides the Competition Act there are legal norms laws that in the narrow sense do not form part of the competition regulation, however, they contain provisions in connection with competition and thus, to some extent with the activity of the GVH as well. Examples for such legal norms relate to certain regulated sectors and natural monopolies, as the Electronic Communications Act, the Act on Electricity or the Act on Railway Transport (and their counterparts in Community law). The authorities established for the supervision of the given sectors (the National Communications Authority, the Hungarian Energy Office and the Hungarian Rail Office) enforce these legal norms. At the same time, in order duly to consider competition aspects, in some matters the law provides for the co-operation of these sectoral authorities with the GVH, the framework of which is established by co-operation agreements between them.