Systems and methods for the control and management of multipoint conferences are disclosed herein, where endpoints can selectively and individually manage the streams that will be transmitted to them. Techniques are described that allow a transmitting endpoint to collect information from other receiving endpoints, or aggregated such information from servers, and process them into a single set of operating parameters that it then uses for its operation. Algorithms are described for performing conference-level show, on-demand show, show parameter aggregation and propagation, propagation of notifications. Parameters identified for describing sources in show requests include bit rate, window size, pixel rate, and frames per second.