We introduce LensMouse, a novel device that embeds a touch-screen display -- or tangible 'lens' -- onto a mouse. Users interact with the display of the mouse using direct touch, whilst also performing regular cursor-based mouse interactions. We demonstrate some of the unique capabili-ties of such a device, in particular for interacting with auxil-iary windows, such as toolbars, palettes, pop-ups and dia-log-boxes. By migrating these windows onto LensMouse, challenges such as screen real-estate use and window man-agement can be alleviated. In a controlled experiment, we evaluate the effectiveness of LensMouse in reducing cursor movements for interacting with auxiliary windows. We also consider the concerns involving the view separation that results from introducing such a display-based device. Our results reveal that overall users are more effective with LenseMouse than with auxiliary application windows that are managed either in single or dual-monitor setups. We conclude by presenting other application scenarios that LensMouse could support.

Interaction patterns with handheld mobile devices are constantly evolving. Researchers observed that users prefer to interact with mobile device using one hand. However, only few interaction techniques support this mode of operation. We show that one-handed operations can be enhanced with coordinated interaction using for input the front and back of a mobile device, which we term as Dual-Surface interaction. We present some of the design rationale for introducing coordinated Dual-Surface interactions. We demonstrate that several tasks, including target selection, benefit from Dual-Surface input which allows users to rapidly select small targets in locations that are less accessible when interacting using the thumb with one-handed input. Furthermore, we demonstrate the benefits of virtual enhancements that are possible with behind-the-display relative input to perform complex tasks, such as steering. Our results show that Dual-Surface interactions offer numerous benefits that are not available with input on the front or the back alone.