MAXScript is the 3ds Max built-in scripting language. Its main interface, the MAXScript menu, contains various commands for creating and working with scripts. In addition, the status bar contains a MAXScript Mini Listener, and MAXScript functionality is also available from the Utilities panel.
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Utilities panel > MAXScript
For detailed information about MAXScript, open the MAXScript Help, available from Help menu 
MAXScript Help.