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ObjectARX® (AutoCAD Runtime Extension) is a compiled-language programming environment for developing AutoCAD applications. The ObjectARX programming environment includes a number of dynamic link libraries (DLLs) that run in the same address space as AutoCAD and operate directly with core AutoCAD data structures and code. These libraries take advantage of the AutoCAD open architecture, providing direct access to the AutoCAD database structures, graphics system, and AutoCAD geometry engine to extend AutoCAD classes and capabilities at runtime. Additionally, you can use DLLs to create new commands that operate exactly the same way as native AutoCAD commands.
You can use ObjectARX libraries in conjunction with other AutoCAD programming interfaces, such as AutoLISP or VBA, enabling cross-API integration.
The ObjectARX programming environment is described
in the ObjectARX Developer's Guide. The
documentation is part of the ObjectARX Software Development Kit,
which can be downloaded from the Development Tools section of the
Autodesk website. For more information,
click Help menu 
Additional Resources Developer
Help. Click
ObjectARX once the Help systems opens.