A group identifier represents an association between each of a number of different abbreviated namespace identifiers with a corresponding hierarchical namespace. A specific method is presented for estimating the number of inputoutput operations needed for given inner and outer data tables, which method models the retrieval of randomly arranged data from that table. In one embodiment, thermal inhibition is used to prevent the metabolism of a pre-photosensitizing agent in epithelial tissue surrounding a treatment site. Heated inhalers are subsequently weighed to detect and reject nonconforming inhalers where a nonconforming amount of propellant has leaked. Further, in the mounted state of the internal tray being mounted in the mounting portion, the engaging portion catches the internal tray in such a manner as to prevent the internal tray from being disengaged from the mounting portion. In particular, the present invention relates to a wireless communication device, wherein a broadband internet connection between said communication device and a data network is used.