Normative Rules

Reactor support belongs to the Visual LISP extension layer.
Autodesk documents reactor support as requiring (vl-load-com) before reactor functions are used.
Autodesk documents reactor support as available only on Windows.
Reactor constructors accept application data and callback bindings; object reactors additionally accept an owner list.
Reactors are host-event-driven objects; callback execution order is therefore determined by host events rather than ordinary expression sequencing.