- Macro definition:
  - A macro is a script containing a set of other NeXtMidas commands.
  - Macros can include procedures and subroutines.
  - Macros are stored in a text file with the extension `.mm`.
  - Macros are plain-text and can be edited with any standard text editor.

X-Midas Users Take Note:
NeXtMidas macros are plain text files with the extension `.mm` that get run directly. X-Midas macros use both `.txt` (plain text) and `.mcr` (compiled) extensions since X-Midas macros require compilation. NeXtMidas macros do not need to be compiled!