A sensor including a sensing layer is disposed over an electrode or an optode and a layer-by-layer assembled mass transport limiting membrane disposed over the sensing layer. A static link is examined in dependence on the assessment of the link as to whether the display of the link on the second network page should be continued. The external device is operated with the backend host according to an operating method including the following steps. The discharge vessel contains a filling which essentially comprises the following substances: rare gas, oxygen, halogen consisting of chlorine, bromine, iodine, or a mixture thereof, as well as mercury in a quantity greater than or equal to 0.