Techniques for programmatically coordinating, and synchronizing execution of, automated testing in event-driven systems. An adaptation to various uses is available because the linkage device is designed with connections between the inputs and the outputs, which can be preset and changed by means of the program unit. For each tile that contains part of a possibly repetitive feature, the server replaces that part with the dominant color of the tile. In the identity-blocking service, the service promoter may disclose the current physical location of a mobile subscriber to a third party subscribing to the identity-blocking service. A drive shaft is attached to the motor and extends toward the orifice.