- The current `MessageQueue` (`MQ`):
  - Used to send a Message.
  - (More will be said about this later.)
- The `Results` table (`MR`):
  - Can get and set (put) results.
  - Yes, that's about it.

      MR.put("KEY", "results value");
      MR.put(rename, calculatedValue);

- The `MWindow` (`MW`) (graphical primitives only):
  - Handle to the graphics library being used.
  - (Not covered in this module.)

X-Midas Users Take Note:
Since NeXtMidas makes it easy to create real-time controls that alter variables held privately inside a primitive (shown later in this module) there is rarely a need to access results parameters from a primitive except to store the results of a computation (which is always done in the `close()` method). As a rule NeXtMidas primitives never poll the values of results parameters.