A register arrangement that enables a host CPU to optimize its accesses to registers in a network interface in order to reduce the impact of such accesses on the CPU performance. A test pattern generator stores only a small number of center test vectors which serve as centers of clusters. It is determined whether the portion of the background image information corresponding to the sub-region is stored locally with respect to a program or remotely with respect to the program. The local device, voice applications rendering agent and management system may be interconnected via a communications network. The high current may result from a lightning strike inducing high current flow through the conduit and fluid flow components connected inline with the conduit.