How to: Activate Workbooks
Applies to: The information in this topic applies to document-level projects and application-level projects for Excel 2007 and Excel 2010. For more information, see Features Available by Office Application and Project Type.
To activate a workbook
You can index into the Workbooks collection using either integers (indicating the position within the collection) or workbook names. If you want to refer to a workbook by name, you must use the name as it appears in the title bar, which does not include the file name extension until you save the file.
To reference individual workbooks
Use the position number or the name of the workbook.
To activate the workbook associated with a document-level project
In document-level projects only, activate the workbook by using ThisWorkbook.