Introduction to the PANEL Command:
- The PANEL command is used to bring up a generic "panel" to which controls and other graphical primitives can be attached.
- The panel is divided up into several sections.
  - The left section is the Controls Section. This is where all of the controls will be put (by default).
  - The rest of the panel is split up into a number of Panes the number and size of which are configurable. These panes can hold any graphical primitives such as PLOT and LIST2.
  Click image for larger view.
- Since PANEL will be running alongside other primitives, it will need to be in a PIPE section.
  - Typically PANEL will be on the first line inside the pipe section.
```
startmacro
  pipe on
    panel
    ...
  pipe off
endmacro

procedure processMessage m:msg
  say "Got message name=^msg.name info=^msg.info data=^msg.data"
return
```