The "Open New HyperText File" menu item allows 
replacing the current hypertext file with 
another. This is done via a call to the 
NewHyperTextFile method of the HTDisplayBox 
component. This method clears the old display 
completely, then adds the new filename to the 
history list (if the History List option is 
enabled, see the "History List" menu item) up 
to the maximum history list items set (via the 
MaximumHistoryItems property.)

When this is done, any changes to the behavior 
of the demo program from other menu options 
take effect automatically.
 