A product display apparatus including a product supply module that includes a support frame and defines a storage area. A call is initiated to an endpoint, where the endpoint is registered with a messaging system and is configured to forward incoming messages to the messaging system. In another aspect of the invention, materials that have a propensity to outgas are shielded from direct exposure to light energy. When the cache manager receives the response data and the cache control indicators from the HTTP daemon, the cache manager can modify the information stored in the HTTP cache as well as control the transmission of the response data in accordance with the cache control indicators. This reduces non-specific binding of IgG’s from the serum to the solid phase surface and thereby reduces the occurrence of false positive readings in the immunoassay.