Touch Panels:

In case of touch panels, displayed objects or screen positions is permitted to be selected with the touch of a finger. A usual application of touch panels is for the selection of processing options that are represented through graphical icons. Some systems, such like the plasma panels, are designed through touch screens. Other systems may be adapted for touch input by fitting a transparent device along a touch-sensing mechanism over the video monitor screen. Touch input may be recorded utilizing optical, electrical, or acoustical methods.