MS Excel
To save a workbook, you:

Click the save button on the standard toolbar from the menu
Select Edit > Save
Click Save on the Windows Start button
Press Ctrl+ F5

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MS Excel
How do you select an entire column?

Hold down the shift key as you click anywhere in the column
Hold down the Ctrl key as you click anywhere in the column
Click the column heading letter
Select Edit > Select > Column from the menu

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MS Excel
To view a cell comment

Position the mouse pointer over the cell
Click the edit comment command on the insert menu
Click the display comment command on the window menu
Click the comment command on the view menu

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