MS Excel
You can activate a cell by

Pressing an arrow key
All of these
Clicking the cell
Pressing the Tab key

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MS Excel
To view a cell comment

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

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MS Excel
How do you select an entire column?

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

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