1. A method of manufacturing a portable computing device, comprising the steps of: (1) maintaining a table comprising stimulus and response data for possible hardware components that may be interfaced with the computing device; (2) performing one manufacturing step in the manufacture of the portable computing device by interfacing one of the possible hardware components with one other component of the computing device; and (3) performing one other manufacturing step in the manufacture by: (i) applying a stimulus to the interfaced hardware component, and reading a response from the interfaced hardware component in response to the applied stimulus; and (ii) identifying the interfaced hardware component from a correlation of the response with the stimulus and response data.