anchor.diff:  increase from left to right, and Y coordinates increase from bottom to
   top. The web interface and registered grid controllers display 64 cues
   at a time in an 8&times;8 grid, and can be scrolled around that grid.
  -The user can set the web interface to track the scroll position of a
  -registered grid controller. When that is done, scrolling either
  -interface will cause the other to scroll in the same way, so the
  -browser window can act as documentation to help the user learn the cue
  -names associated with each available cue pad on the controller.
  +The user can configue (&ldquo;link&rdquo;) the web interface to track
  +the scroll position of a registered grid controller. When that is
  +done, scrolling either interface will cause the other to scroll in the
  +same way, so the browser window can act as documentation to help the
  +user learn the cue names associated with each available cue pad on the
  +controller.
   
   image::assets/ShowGrid.png[Web interface]
   
  
positive.code: 
  |`:color`
  
  |Sets the color of the cue within the grid for hinting about purpose
  and relatedness to help operators learn and understand the interface.
  If not specified, white is used.
  
  |===
  
  
negative.code: http://deepsymmetry.org/afterglow/doc/afterglow.effects.cues.html#var-cue[API
  documentation] for the full details.
  
  [cols="1,6", options="header"]
  |===
  |Parameter
  |Purpose
  