Edit <reference>

Object name (progid)
Select an object name from the combo box's list (Used Objects, see Workspace settings) or type in name of any other existing COM/OLE object. Click Test Object button to make sure that such an object exists.

The <reference> references a type library of a COM/OLE object. It doesn't create the object but makes all the constants and enumerations defined by the type library available to all the following scripts.

See Also
Working with Project Tree