Provided are a method of stabilizing a leuco dye storable as a liquid for a long time, a method of reducing nonspecific color development thereof at a time of a color development reaction, and a stable liquid reagent composition using the methods. For each external object imported, the corporate portal maps external users and external groups identified by the native security into corresponding portal users and portal groups according to a predefined mapping process, and stores the results in a manner that associates the external object with those portal users and portal groups. In one form, the bottom connection is a pair of non-parallel links of dissimilar length. When the client receives the HTTP response, it sends another GET message without audio data, allowing the server to send another response. A traffic mix is admissible, if for each real-time traffic class both the stability and the delay constraints are fulfilled.