The extended AutoLISP functions provided consist of curve measurement, data conversion, object-handling, property-handling, collection manipulation, and dictionary-handling functions. The function names are prefixed with vlax-. These functions are in addition to the ActiveX® methods provided through vla-* functions. Before you can use the AutoLISP extensions, you must issue the following function:
(vl-load-com)
The vl-load-com function also initializes ActiveX support for AutoLISP.