- Using `MENU <command>`:
  - Lists all commands matching a given name. For example:

        nM> menu mess*
         MESSAGE-I           MESSAGELOG-P        MESSAGELOGS;UCL-P

  - Lists all user macros in the test area of SYS. For example:

        nM> home test sys
        nM> menu sup=%
        <a long list of % macros>

- What it shows:
  - The names of all matching commands
  - The option tree the command is in (unless it is in SYS)
  - The command type (M=Macro, P=Primitive, I=Intrinsic)