- Sending Messages (the `MESSAGE` command):
  - Messages can be sent from a macro using the `MESSAGE` command.
    - Typical usage:

          plot/id=plot1 ...
          ...
          message send ID="PLOT1" NAME="OPENFILE" DATA="world.prm"

    - See the `MESSAGE` explain file for details.
  - The messages sent or received by a command are listed in the explain file for that command.
    - Example:

          nM> explain plot messages

X-Midas Users Take Note:
Be careful when porting macros from X-Midas to NeXtMidas since the parameters for `MESSAGE` differ slightly. In general it is best to use the `TAG=` in NeXtMidas.