Select Base and Target for Diff:

  <form action="<?cs var:anydiff.changeset_href ?>" method="get">

     <label for="old_path">From:</label>

         var:anydiff.old_path ?>" size="44" />

      <label for="old_rev">at Revision:</label>

         var:anydiff.old_rev ?>" size="4" />

     <label for="new_path">To:</label>

         var:anydiff.new_path ?>" size="44" />

      <label for="new_rev">at Revision:</label>

         var:anydiff.new_rev ?>" size="4" />

      <input type="submit" value="View changes" />

  </form>

  Note: See 

  ?>/TracChangeset#ExaminingDifferencesBetweenBranches">TracChangeset for help on using the arbitrary diff feature.