Supervising a network, which network comprises a plurality of components having ports at least some of which ports are connected by links to ports on other components, at least one component including means to ascertain the source addresses of the remote component or port to which each of its ports is connected when data is received from that remote component, including:. A functional material with the above-mentioned properties shall serve to offset any adverse effect of a migration of this kind, leading to an improvement in the fatigue resistance of the memory cell. Also provided is a novel enzyme L-proline-4-hydroxylase which is useful for the process, a gene of L-proline-4-hydroxylase which is useful for the process, a transformant containing the gene, and a process for producing L-proline-4-hydroxylase using the transformant. A method of manufacturing the storage capacitor by two photolithography processes is also shown. A differential scan can be performed with the two spots relatively close together to generate the slope of the height profile.