Defines an AutoLISP function symbol as an external subroutine
Supported Platforms: Windows and Mac OS
(vl-acad-defun 'symbol)
Type: Subroutine or Symbol
A symbol identifying a function.
Type: Integer
A numeric value.
If a function does not have the c: prefix, and you want to be able to invoke this function from an external ObjectARX application, you can use vl-acad-defun to make the function accessible.
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