MS Excel
If you begin typing an entry into a cell and then realize that you don't want your entry placed into a cell, you:

Press the Enter button
Press Esc
Press the Erase key
Press the Edit Formula button

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

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