What is the function of "Calculate Now" in Microsoft Excel and what is the shortcut key of "Calculate Now"?

F9 calculation. Calculates all worksheets in all open workbooks.

CTRL+ALT+SHIFT+F9 rechecks dependent formulas, and then calculates all cells in all open workbooks, including cells not marked as needing to be calculated.

CTRL+F9 minimizes a workbook window to an icon.

SHIFT+F9 calculates the active worksheet.

CTRL+ALT+F9 calculates all worksheets in all open workbooks, regardless of whether they have changed since the last