MS Excel
Excel uniquely identifies cells within a worksheet with a cell name

Cell locator coordinates
Cell names
Column latters and row numbers
Column numbers and row letters

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MS Excel
You can edit a cell by

Selecting Edit > Edit cell from the menu
Clicking the formula button
Double clicking the cell to edit it in place
None of these

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MS Excel
How do you delete a column?

Select the row heading you want to delete and select Edit>Delete from the menu
Right click the column heading you want to delete and select delete from the shortcut menu
Select the column heading you want to delete and select the Delete Row button on the standard toolbar
Select the column heading you want to delete and select Insert Delete from the menu

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