MS Excel
To hold row and column titles in place so that they do not scroll when you scroll a worksheet click the

Hold titles command on the edit menu
Unfreeze panes command on the window menu
Split command on the window menu
Freeze panes command on the window menu

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MS Excel
A circular reference is

Always erroneous
A cell that points to a drawing object
Geometric modeling tool
A formula that either directly or indirectly depends on itself

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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
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
Right click the column heading you want to delete and select delete from the shortcut menu

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