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Its about monsters(midget size or a bit taller) that lives in the underground and scared of light, i remember that the people in the movie are using flashlights as a weapon against them.
In the end the guy sacrificed himself to the monsters and joined them in the underground.
Im trying to search the title of the movie that i watched and scared the shit out of me when i was a kid.Its pretty old movie i think i watched it somewhere in the 90's or early 20's Bleeders has elements of your question.Underground dwelling, light sensitive mutants(on the small side) running around in tunnels. Here is the last 15 minutes of the movie (in German sadly) but adequate to validate this is the film.These are small applications that provide useful information usually in a graphical manner.The dashboard also contains a To Do List which details any outstanding system messages.