You don't need a Class module (*cough*) or an Add-In.
If you put this in the ThisWorkbook code module of your PersonalMacroWorkbook, the sub BounceBack will return you to the most recently used worksheet from any open workbook to any open workbook.
After copy pasting, it will not work until you close your Excel and re-open it. Edit the short-cut key to your taste.
(*cough*) ThisWorkbook, sheet and user form code modules are all code modules of Objects and can accept the kind of coding that a Class Module can take. In a sense, the built in Excel object code modules are Class modules.
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