A power management and data center resource monitoring mechanism is provided for selecting new processing elements in a data center. The trailer is attachable to a vehicle, such as a bicycle, and features a floor capable of retracting into a running position where an animal is able to run on the ground and deploying into a riding position where an animal can ride without having to exert itself. The transmitted energy impulses, comprising magnetic andor electrical, mechanical andor acoustic, and optical andor thermal energy, stimulate the selected nerve fibers. In response, the gateway closes in the database all the saved transactions authorized using the one terminal, and responds to the authorization request message by providing the one terminal with a remote synchronization command commanding the one terminal to clear the running total from the memory. The system is architected so that the drawing handlers are registered independently of the other system components, such that new types of drawing handlers can be added without requiring changes to the other system components. The second slider is connected to the first slider in such a way that the second rail is perpendicular to the heating plate.