Abstract: A media appliance comprising: video apparatus for outputting signals to a screen; a control device allowing a user to control the output of signals from the video apparatus to the screen, thereby selecting a viewing activity; a network interface for accessing a packet-based network; a memory storing a communication client application; and processing apparatus, coupled to the memory, network interface and video apparatus, and arranged to execute the communication client application; wherein the client application is configured so as when executed to allow the user to conduct bidirectional communications with other users via the packet-based network, and output notifications to the user of incoming communication events received from other users over the packet-based network; and wherein the client application is further configured to defer one or more of said notifications of incoming communication events received during said viewing activity, determine a delineation in the viewing activity, and automatically o

Abstract: Television tuner emulation techniques are described. In an implementation, a television tuner is emulated through execution of software on a processing system by a computing device, the emulated television tuner includes functionality to obtain television content over an Internet Protocol (IP) based network. The functionality of the emulated television tuner is exposed to one or more applications that are executed by the computing device such that the application is not aware that the television tuner is emulated through execution of the software.

Abstract: A first portion of programming aired prior to a first time is obtained via a unicast session with a server, the first portion including previously aired programming. When the programming data being sent via the unicast session catches up to a multicast broadcast of the programming, the unicast session is terminated and a switch is made to obtaining a remaining portion of the programming from a different source other than the server. This different source can be, for example, a local storage device or a multicast broadcast of the programming.