Formula_text can be text, a number, a reference, or a formula in the form of
text, or a reference to a cell containing any of the above.
The formula should appear as it would in an English version of Excel,
using US English regional settings.

reference

Reference specifies where formula_text is to be entered.

Return Value

Zero if the function has been called successfully; non-zero
if the function could not be called.
See Error codes for a list
of return values.

Remarks

See the Microsoft Excel on-line Help for full details about
this function.