_Application::ActiveWorkbook property
Office 2013 and later
Returns a Workbook object that represents the workbook in the active window (the window on top). Returns Nothing if there are no windows open or if either the Info window or the Clipboard window is the active window.
Namespace: Microsoft.Office.Interop.Excel
Assembly: Microsoft.Office.Interop.Excel (in Microsoft.Office.Interop.Excel.dll)
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