Example
In many Excel applications, the VBA code takes actions directed at the workbook in which it's contained. You save that workbook with a ".xlsm" extension and the VBA macros only focus on the worksheets and data within. However, there are often times when you need to combine or merge data from other workbooks, or write some of your data to a separate workbook. Opening, closing, saving, creating, and deleting other workbooks is a common need for many VBA applications.
At any time in the VBA Editor, you can view and access any and all workbooks currently open by that instance of Excel by using the Workbooks property of the Application object. The MSDN Documentation explains it with references.
