The Excel 365 Help 'Excel keyboard shortcuts and function keys' contains many entries like these:

Open a spreadsheet: Ctrl + O
Save a spreadsheet: Ctrl + S
etc.

Shouldn't that be 'Open a workbook', etc? Unless, depressingly, I've forgotten even more of the basic stuff, using those commands operates on all worksheets, not just the active one.

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Terry, East Grinstead, UK