Returns information about the cell, range of cells, command on a menu, tool on a toolbar, or object that called the macro that is currently running
static int Caller( CXlOper& xloRef );
A reference to a CXlOper that will describe the caller 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.