ISINTERFACE Function

Purpose | Determine whether an object supports a particular interface.
Syntax | IfaceValid = ISINTERFACE(ObjectVar, InterfaceName)
Remarks | The object referenced by the parameter ObjectVar is tested to determine if the specified InterfaceName is supported. If so, the value true (-1) is returned. Otherwise, the value false (0) is returned.
See also | CLASS, INTERFACE (Direct), INTERFACE (IDBind), What is an object, anyway?