The claimed subject matter relates to an architecture that can enhance and/or simplify tactile-based I/O transactions in connection with a user-interface (UI) of limited form factor. In particular, the architecture can monitor a position of a selector object such as an operator's finger relative to a UI display as the selector object hovers or moves above the UI display. Based upon this position, an analogous coordinate in the UI display can be determined, and a portion of the UI display substantially centered at the coordinate can be modified. As one example, the UI display can be modified to increase the magnification scale (e.g., a virtual magnifying glass) of the portion of the display indicated by the selector object.