A system for supplying streaming media or other media sources to clients, said system providing for selection of internet based audio content providers based on arbitrarily assigned numbers that function as proxies for the URL or IP address of the audio content providers. Substituted cyclic compounds, libraries of the compounds, and methods of using the compounds to treat bacterial infections are also disclosed. An expandable cavity part is moveably mounted with respect to the second section. During a runtime phase, real-time data from an HVAC control system is input to the generated FDD system for fault detection and diagnosis.