CalculateFull does a more complete recalculation of the workbook. It doesn't
just recalculate the cells which excel considers in need of calculation -
this is what calculate does. Since you didn't write the macro, the original
author appeared to want to do a CalculateFull (which did not exist as a macro
command in xl97 and thus many used the sendkeys combination you show).
From VBA help:
CalculateFull:
Forces a full calculation of the data in all open workbooks.
CalculateFullRebuild: (added in xl2002 I believe)
For all open workbooks, forces a full calculation of the data and rebuilds
the dependencies.
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Calculate:
Calculates all open workbooks, a specific worksheet in a workbook, or a
specified range of cells on a worksheet, as shown in the following table.
When using "calculate", To calculate Follow this example
All open workbooks - Application.Calculate (or just Calculate)
A specific worksheet - Worksheets(1).Calculate
A specified range - Worksheets(1).Rows(2).Calculate