C: functions are automatically exported to AutoLISP. Plain vlisp/vill
lisp functions must be exported either with (vl-acad-defun funcname) or
their symbols may be exported with a special compiler pragma, defined
either in the LSP file or in the GLD (global declarations) file. Better
use special prefixes for such functions.

.GLD:
(AUTOEXPORT-to-ACAD-PREFIX
  ;| name prefixes for functions to be autoexported to AutoCAD: (strings) |;
  "myx-*"
  )
or one by one
.LSP:
(pragma '((export-to-acad myx-func1 myx-func2)))

Note: There may exist known bugs in vlisp and vill with lists of atomic
symbols and dotted pair lists in such functions arguments and return
values. See [7].

Functions exported by external apps which are used in your application
must be defined via XDF.

Symbols (variables) whose values are updated in Visual Lisp and which
values are also used in AutoLISP or AutoCAD (the menu e.g.), first may
be marked for the compiler to be external with:
  (pragma '((not-localize myx:symbol)))
but the value must be exported with
  (vlisp-export-symbol 'myx:symbol)
each time the value is changed in Visual Lisp and control is returned
to AutoCAD to be able to get the latest value in AutoLISP or in AutoCAD
with !myx:symbol

You may forget this whole chapter with AutoCAD 2000, however you might
need to export your function from the protected namespace then with
VL-DOC-SET.
See also http://www.autodesk.com/support/techdocs/td17/td175363.htm

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