The requirements for using the OUTPUT, INPUT-OUTPUT, BY-VARIANT-POINTER, BY-POINTER, and AS Data-type options depend on the COM object method or property, the implementation of the COM object, and how you plan to use the parameter or property in your application. In many cases, expression is all that you require for a property write or method parameter. For more information on and examples of accessing COM object properties and methods, see the information on COM object references in the chapter on ActiveX Automation and in the chapter on control container support in OpenEdge Development: Programming Interfaces.
