Various techniques are disclosed for forming bichromal balls or multicolored balls by laser-based methods. Records of changes to the models or the configurations represented by them are maintained, thereby, for example, providing bases for determining current states, prior states and histories of changes. The device may include a core element including a sensor assembly and conductor members, from which the various configurations may be established including a plurality of different current path configurations. In one embodiment, it is then left to the individual as to whether they want to continue registering for the service. When the types are the same, the tray detection operation is omitted. The service provider further includes a computer network communications module for communicating with computers via the computer network.