Application screenupdating in powerpoint 2016
I already tried using Workbooks versus Windows and there was no difference, however the instance idea is interesting.
For information about this keyword, consult the language reference Help included with Microsoft Office Macintosh Edition. A volatile function must be recalculated whenever calculation occurs in any cells on the worksheet.
Office 2010 require different file open to create different instances. Office 2013 forces each workbook into it's own instance.
However Windows 8 treats switching instances diferently.
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.
When used without an object qualifier, this property returns an Application object that represents the Microsoft Excel application.