How do you lock a cell in a formula

Excel tip:

Using Alt in Save Dialog Box

When you are saving (or opening) a file, try these;
(Note the numbers are on the keyboard not the numeric keypad)
1. Go to previous folder Alt+1
2. Go up one folder level Alt+2
3. Search the Web Alt+3
4. Delete selected file Alt+4 or Delete
5. Create a new folder Alt+5
6. Cycle through all views Alt+6 repeatedly
7. Display the Tools menu Alt+7

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