A graphical display system in which a background graphical image is at least partially visible within a foreground window. Examples of foreground windows include pull-down menus or pop-up dialog boxes. In a specific example embodiment, the background image is digitized waveform data for a digital oscilloscope,...http://www.google.com/patents/US5896131?utm_source=gb-gplus-sharePatent US5896131 - Video raster display with foreground windows that are partially transparent or translucent
