      *     [Sequence]:
      *                   |3 ------>|
      *                   |         |
-     *         1 -> 2 -> |4 ------>| -> 7 -> anyway
-     *                   |         |
+     *         1 -> 2 -> |4 ------>| -> 7 -> success -> anyway
+     *                   |         |        (or error)
      *                   |5 -> 6 ->|
      *
      * </pre>

     *             ]},
     *             function_7
     *         ],
     *         error  : _onErrorHandler,
     *         anyway : _onFinallyHandler
     *     });

     *         // OR
     *         parallel: [<asyncDef>, ... ]
     *
     *         success : function():void {},  // optional
     *         error   : function():void {},  // optional
     *         anyway  : function():void {}   // optional
     *     }
