Returns the reference of the active cell in the selection as an external reference
static int ActiveCell( CXlOper& xloRef );
A reference to a CXlOper that will contain the active cell if the function succeeds.
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.
See the Microsoft Excel on-line Help for full details about this function.