A computer implemented system for assisting an operator in designing and customizing a virtual luminaire by selecting options. A noise level measuring circuit measures the existing level of cross-talk noise on the subscriber line. When the \u201c+\u201d key or the \u201c\u2212\u201d key is depressed after the first 1-frame image data of the panorama image data stored in the VRAM is reproduceddisplayed on the display screen of the display unit, the CPU starts scrolling the displayed image on the display screen of the display unit. Each lower edge includes a front lower edge portion longer than the upper edge and a rear lower edge portion which is shorter than the upper edge. An optical sensor is also disposed within the surface of a housing, and detects relative movement of this surface against an external surface, as caused by relative movement of the user’s finger. An authentication tag length is also included to permit variable length tags to be used.