The invention relates to a tilting nozzle cap which can be allocated to a container, comprising an outer part and an inner part. Each of the messages is broadcast beginning at one of several predetermined message start opportunity times that have known timings relative to a reference time. On the other hand, the printing media housing section 210 has an opening 215 formed in a lower part thereof and in which part of housed printing media appears, thereby enabling the pack to come into contact with a sheet feeding roller of the printer when the pack is installed in a printer. The invention also concerns a perfusion station into which such perfusion units can be integrated as well as a method for cell culture, preservation, proliferation and utilization of such cells. The present invention relates to the direct treatment of macular degeneration, particularly age-related macular degeneration, by administering a complement inhibitory protein intraocularly or systemically. The controller controls initiation in dependence on behaviour of the data processing apparatus downstream of the trace data generator with respect to trace data flow.