Application.SupportsMultipleDocuments Property (Project)
Always True for Project and any other application that supports multiple documents (projects). Read-only Boolean.
expression A variable that represents an Application object.
The SupportsMultipleDocuments property is useful with Automation. For example, suppose you want to open a second document in the application referred to by a variable. If the variable refers to one of several possible applications, you may want to use the SupportsMultipleDocuments property to confirm that the application currently referenced by the variable can have more than one document open at a time.