The display of a notebook computer includes a privacy filter extending over the display screen to limit the viewing angle within which the image on the screen can be discerned. The method includes performing migration velocity analysis on a seismic time record section and depth migrating the time section for offsets exceeding one-half a distance between a seismic energy source and a seismic receiver most distant from the source during acquisition of seismic data used to generate the time record section. The additional-object registration unit identifies an image of the additional object presented in the additional-object specification field and the processing selected in the processing specification field, and registers the image and the process associated therewith. A battery voltage indicator is provided at the side of the action of the weapon. The first PODE and the second PODE are on respective adjacent edges of the first active region and the second active region. The methods and systems provide substantial savings in computing resources while still ensuring every wheeze in a respiratory signal is detected.