code: function Message_post(body,       // @arg Any - message body, instanceList[id]#inbox(,body,)
                        callback) { // @arg Function = null - callback(err:Error, buffer:Array):void
                                    // @desc post to message asynchronously.
  //{@dev
      $valid($type(callback, "Function|omit"), Message_post, "callback");
  //}@dev
  
      var taskCount = Object.keys(this._instanceList).length;
      var task = new global["Task"](taskCount, function(err, buffer) {
                              if (callback) {
                                  callback(err, buffer);
                              }
                          }, { "name": "Message#post" });
  
      for (var id in this._instanceList) {
          var instance = this._instanceList[id];
  
          if (instance) {
              // call       Foo#inbox(task:Task, body:Any, id:String):void
              // call WebWorker#inbox(task:Task, body:Any, id:String):void
              instance[this._methodName].call(instance, task, body, id);
          }
      }
  }
docs: --- implement -------------------------------------------