A rotating flow head has a lubricated bearing pack for isolating bearing elements from wellbore fluids under pressure. Non-CLKRUN# compatible PCI devices in the system are identified and whether or not the non-CLKRUN# compatible PCI devices are enabled is determined. As part of the user authentication procedure, a password verification procedure is performed which comprises the steps of requesting a password from the user and comparing the entered password with an expected valid one. The approximate solutions to the k-set coverage formulation are then used to select at least some of the potential network elements for use in a minimum cost network. Other embodiments are also disclosed. The capacitive filter circuit is connected on the wire connection section of a first one of the terminals for providing electromagnetic induction suppression.