We present Virtual Thumb, a set of software-based conceptual techniques that enables a user to handle multi-touch operations under the limited physical resources available. This simple and novel technique allows users to comfortably handle multi-touch pinching gestures such as zooming, scaling, and rotating using only one finger. Hence, occlusions caused by two fingers are reduced by half, gestures are not restricted by the physical boundaries of the screen, and physical limitations of the user\'s fingers are reduced.
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