A door module includes a bracket having a hinge portion which permits alignment of the handle support of the door module with a door shell attachment portion. Each floor section includes a base plate permanently coupled to a foundation, and a surface plate removably attached to the base plate. Each root cell of the multicast traffic is classified based on multiple corresponding classes of service. Embodiments of the invention may utilize scaleable architectures to process any number of users andor recipients. The information processing apparatus includes an authentication information storage unit for storing authentication information of a user for accessing the server, and a request transmission unit for attaching the authentication information of the user of the client terminal to a request based on the request given by the application of the client terminal, and transmits the request to the server. After processing, the results, if any, are sent as a protocol request message to the server, which extracts the result from the protocol request message and puts the result in a protocol response message, which is sent to the requesting client.