| 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? |