Blind Carbon Copy
For emails. It is used to send a copy of the email to somebody without the original person receiving it knowing that you sent a copy.
To lock multiple rows (starting with row 1), select the row below the last row you want frozen, choose the View tab, and then click Freeze Panes. To lock multiple columns, select the column to the right of the last column you want frozen, choose the View tab, and then click Freeze Panes<span>.
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When using a public computer or network, you should always browse appropriately and log out of personal accounts when you're done.