The ability to 'Preview' both highlight and shadow clipping in a photograph gives the photographer an easy way to identify these and correct them. This feature is available in both Lightroom and Bridge.
Using the photograph above shows an example in Lightroom. Note the "Clipping Indicators" located at the top of the Historgam panel. If you click on one or the other Lightroom will show you all areas of the photograph that are being clipped either in the Blacks or Whites.