1. A method, comprising by a client network node: on a display, displaying a graphical user interface comprising at least one communication control for managing communications with other network nodes and at least one browser control for navigating to different network resource addresses; generating human perceptible realtime output from realtime communication data relating to a realtime communication session with at least one other client network node, wherein the human perceptible realtime output comprises graphical realtime output, the generating comprises displaying the graphical realtime output in the graphical user interface; in the generating of at least some of the human perceptible realtime output, managing operation of the client network node based on at least one performance target; and in the graphical user interface, displaying a graphical representation of a network resource identified in connection with the browser control.