Some embodiments provide novel inline switches that distribute data messages from source compute nodes to different groups of destination service compute nodes. A transfer device, which transports racks with specimen slides from the stainer to the coverslipper, is provided between the stainer and the coverslipper. Generated revenue is preferably shared among the advertising services provider, the partner, and the affiliate. In other embodiments the source is charged via linear inductive charging. Also described is a heat transfer system comprising the heat transfer fluid. A stator fixes the magnets and the coil.