anchor.diff:  
   ----
   groovy:000> :doc java.util.List
  -http://docs.oracle.com/javase/1.7.0/docs/api/java/util/List.html
  -http://groovy.codehaus.org/groovy-jdk/java/util/List.html
  +http://docs.oracle.com/javase/7/docs/api/java/util/List.html
  +http://docs.groovy-lang.org/2.4.2-SNAPSHOT/html/groovy-jdk/java/util/List.html
   ----
   
   will open two windows (or tabs, depending on your browser):
  
positive.code: [[GroovyShell-Variables]]
  ==== Variables
  
  Shell variables are *all* untyped (ie. no `def` or other type information).
  
  This *will* set a shell variable:
  
  
negative.code: will be used, or if there is none, then the preference is removed and
  the default is used.
  
  ===== `colors`
  
  Set the shell’s use of colors.
  
  Default is `true`.
  
  [[GroovyShell-show-last-result]]
  ===== `show-last-result`
  
  