The invention provides a method of diagnosing a system, a method of operating an aggregating system for system diagnosis and an aggregating system for system diagnosis, which are effective for achieving comprehensive and effective system cost reduction. Products and squares of long integer values are recursively reduced to a combination of products and squares reduced-length integer values in a host processor. Techniques may be used to favor one group of users over another. Accordingly, result data that is obtained by executing the control command on the home network device may be received by the control point module. Other implementations include an enclosure for storage of the camera while not being used. The invention advantageously provides a continuous circuit by opportunistically using cross connect links to represent the connection of managed and non-managed portions of a circuit.