- Shared functions between X-Midas and NeXtMidas:
  Pipes
    Can use X-Midas pipes from NeXtMidas.
    Note that the names of any X-Midas pipes will need to be prefixed with `xmpipe:` inside NeXtMidas.

        X-Midas> nm plot xmpipe:_waveb

  Results
    X-Midas results are accessible in NeXtMidas via the `XM.` table.
    In X-Midas:

        X-Midas> res temp 123.0

    In NeXtMidas:

        nM> res/global xm.temp
        D: XM.TEMP      = 123.0

  AUX List
    NeXtMidas uses the X-Midas AUX list.
    Note that all AUX names must be numeric.
    Note that all AUX entries are bound by X-Midas file name limits (80-character-max, lower-case-only, local-disk-only).
  Messages
    Can pass messages between X-Midas and NeXtMidas.
    (More details about this later.)
  Option Trees
    X-Midas option tree imported into NeXtMidas when `nm/on/bg/id=999` is run.