The present invention provides a method and system in which the lower address bits of an IP address are used as a mobile station’s short identifier. An x-ray device serves to generate three dimensional ambient images of a patient. These measurements are continuously recorded over a period of time. Each distinct area can be selected so as to have dimensions much smaller than a wavelength at a frequency of interest. In an embodiment of the invention, a portion of the body adjacent to the leading cotton-head is substantially wider in a direction parallel to the leading edge than a trailing portion of the body whereon the trailing cotton-heads and the pin teeth are disposed. The outer guide member is 7 French or smaller and has a deflectable distal end.