### AutoLISP Developer's Guide and Reference

Source: https://help.autodesk.com/view/CIV3D/2025/ENU/index

Documentation for AutoLISP, a programming language used for customizing AutoCAD and related products like Civil 3D. It covers both developer guides and reference materials for creating custom applications and automating tasks.

```AutoLISP
;; Example of AutoLISP syntax (conceptual, not actual code from the text)
;; (defun c:HelloWorld () 
;;   (princ "Hello, World!") 
;;   (princ)
;; )
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.