Every connected platform carries a formula which returns the version of the Excel formula definitions for that platform. The name follows the platform: `I_XLAM_FB_FUNC_VERSION` for Facebook, `I_XLAM_OCTOPUS_FUNC_VERSION` for Octopus, and so on. There are no parameters. Returns: the version number of the Excel formula definitions of that platform. The number is raised whenever the definitions of that platform change, so it answers the question which version of the formulas a workbook is actually working against. That matters when a workbook behaves differently on two devices: the platform version tells whether the definitions differ or something else does. Two version formulas cover the product rather than a platform: [[I_XLAM_GENERIC_VERSION]] for the generic module and [[I_XLAM_VERSION]] for the extension as a whole.