Marks a user-defined function as volatile. A volatile function must be recalculated whenever calculation occurs in any cells on the worksheet. A nonvolatile function is recalculated only when the input variables change. This method has no effect if it's not inside a user-defined function used to calculate a worksheet cell.
Syntax
expression.Volatile(Volatile)
expression Required. An expression that returns an Application object.
Volatile Optional Variant. True to mark the function as volatile. False to mark the function as nonvolatile. The default value is True