If you installed npdemo1.dll properly you'll see two embedded Delphi forms with different polygons. You can adjust polygon color using scrollbars. It's possible to set initial polygon color through embed tag. View source of this HTML page for details. You can modify embed tag to change form position and size, initial polygon color.
Files fig1.xcv and fig2.xcv are usual text files. Each line contains successive coordinates (X,Y pair) of polygon points. Both X and Y coordinates must be in range from 0 to 200. You can define your own figures to view by means of simple text editor.