Error Checking in Excel
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Thread: Do not want something repeated in a certain column

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    I have a column that will be filled with screen names (testing new software) and in this column I do not want the users to enter the same screen name twice. How do I keep them from doing it??? Thanks.

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    use data validation. a method of preventing duplicate entries is at http://support.microsoft.com/default...;en-us;Q189005

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