Normative Rules

Autodesk treats full ActiveX support as Windows-oriented
BricsCAD extends COM-like compatibility beyond Windows in some versions
clautolisp may emulate Windows-like COM behavior on non-Windows hosts through an explicit compatibility layer
for vla-* wrappers, the AutoCAD ActiveX object model documentation is normative in addition to the AutoLISP wrapper documentation
for vlax-* property, method, variant, safearray, and COM-object functions, COM / OLE Automation semantics are normative insofar as Autodesk exposes them through AutoLISP
where the AutoLISP wrapper constrains or renames the underlying API, the AutoLISP-layer contract takes precedence for call shape and error surface