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Lock Cells. You can lock cells in Excel if you want to protect cells from being edited. In this example, we will lock cell A2. Before you start: by default, all cells are locked. However, locking cells has no effect until you protect the worksheet. So when you protect a worksheet, all your cells (=worksheet) will be locked.
This is strictly a security option; it doesn't save power. You set up Windows to lock itself in the Screen Saver dialog box. To get there in Windows 7, click Start, type screen saver, and select Change screen saver. In Windows 8's Home screen, type screen saver, click or tap Settings, and select Change screen saver.When locked, Windows doesn't power down.Instead, it displays the logon screen--or the screen saver of your choice.ou set up Windows to lock itself in the Screen Saver dialog box. To get there in Windows 7, click Start, type screen saver, and select Change screen saver.