Disclosed herein is multiple filter controller comprising two filters; an inlet valve that regulates the directional inflow of a fluid through the filters; and an outlet valve that regulates the directional outflow of the fluid from the filters. The cutting fluid comprises a solution containing organic moleculesin particular silanes, silanols, and siloxanescapable of forming covalent bonds with such vitreous, crystalline or aggregate materials. The processing unit has a stall-in signal, and an external circuit of the processing unit can control whether the processing unit is stalled according to the stall-in signal. A first timeout is determined for a first session between the first server and the second server to obtain the second service.