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4.3.6 Ticker Tape 2 Part

   The Ticker Tape 2 Part shows you a ticker tape text scrolling in its frame 
   just like the Ticker Tape 1 Part.  This part handler subclasses from 
   Ticker Tape 1; it inherits all of Ticker Tape 1 Part's features.  This 
   handler is improved so that you can update the ticker tape text.  This is 
   an example of how new features can be built upon a part handler by 
   subclassing from the parent part handler. 

   When a large text file is selected to replace the ticker tape text, the 
   text is loaded to the storage unit.  When the text is displayed, a fixed 
   amount of text is retrieved from the storage unit.  This allows the amount 
   of memory required to display the text to be small, regardless of how 
   large the original text file is. 

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