Abstract: A method, apparatus and computer program product are provided for implementing scan-chain-specific control signals as an integral part of a scan chain. A scan input vector including scan data input and a scan control signal is applied to a register latch that forms the scan chain. The register latch includes a logic gate for combining a global clock control (THOLD) signal and the scan control signal. The scan control signal is routed around the register latch and including in a scan output vector including scan data output. Chain-specific control signals are eliminated from a clock control signal distribution tree used with the scan chain of the invention.

Abstract: A method, apparatus, system, and signal-bearing medium that in an embodiment select a subset of windows displayed on an output device for display via an auxiliary output device, e.g., a projector. In various embodiments, the selection of the subset is based on a group affiliation or based on a list of allowed or disallowed applications. In other embodiments, the image on the auxiliary output device is selectively frozen or displays a pre-set image while the image on the output device changes. In this way, the displayed content on the auxiliary output device is selectively controlled, which allows for a more effective presentation.