2.2.7.4.1 External Workbook Links

An external workbook link is a reference to a workbook other than the one in which the source formula (section 2.2.2) resides. It contains the referencing expression, and data relating to that expression. This data includes the workbook location, sheet names, external defined names (section 2.2.7.4.1.1), and an external cell cache (section 2.2.7.4.1.2) for referenced cells in that workbook.