In a method for operating a global, virtual a call center having operators working all over the world, in response to a call from a customer, data suitable for identifying the customer and allocating him or her to a customer group are collected and stored. In one embodiment, the invention includes a memory device register to indicate the presence of a memory device to a computer system, a switch coupled to the memory device register to set the memory device register to indicate the presence of a memory device, and an external interface coupled to the switch to operate the switch. The microphone housing can be sized to be positioned in close proximity to another component surface such as a hearing battery assembly surface. At this time, a chat answer signal indicating that the expected guest accepts the invitation from a chairman is transmitted from the expected guest to the chairman. A third device senses one or more leading edges of one or more electromagnetic waveforms as well as the ultrasonic emissions emitted from the parallel arcing fault.