Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. According to the present invention, there is provided a photothermographic material, in particular, for photomechanical processes, more specifically, for scanners and image setters, which shows low fog and high Dmax, and exhibits little increase of fog even after the photosensitive material after development is stored for a long period of time. A pair of side pieces, one for each side of the row, are provided and are hooked on the associated ends of the first and last runs, ;,. In some embodiments the application in the store is branded, if at all, with a default brand that is not specific to any collaborating network operator, and this default brand may be of the collaboration or of the mediator. The first server then registers with the second server, to receive notification through the direct communication path when respective identified events occur.