anchor.diff:  
   ----
   
  -In the Nifty +++<abbr title="Graphical User Interface">GUI</abbr>+++ screen code (e.g. XML file) you must call the `(int x, int y)` method _without_ any parameters! 
  -
  -[source,xml]
  -----
  -
  -<interact onClick="clicked()"/>  
  +In the Nifty +++<abbr title="Graphical User Interface">GUI</abbr>+++ screen code (e.g. XML file) you must call the `(int x, int y)` method _without_ any parameters!
  +
  +[source,xml]
  +----
  +
  +<interact onClick="clicked()"/>
   
   ----
   
  
positive.code: 
  |===
  
  See also: link:http://sourceforge.net/apps/mediawiki/nifty-gui/index.php?title=MarkUp[http://sourceforge.net/apps/mediawiki/nifty-gui/index.php?title=MarkUp]
  
  
  == Use ScreenControllers for Mutally Exclusive Functionality
  
negative.code: 
  Learn more from the NiftyGUI page:
  
  *  link:https://versaweb.dl.sourceforge.net/project/nifty-gui/nifty-gui/1.3.2/nifty-gui-the-manual-1.3.2.pdf[Nifty GUI - the Manual: Effects]
  *  link:https://github.com/nifty-gui/nifty-gui/wiki/Effects[Effects] 
  
  
  == Add Sound Effects
  