This read-only enumerated object identifies whether a given software file set is the one currently-executing(1) or scheduled as next-boot(2), with the file set number itself matching its own table instance. An admin uses this to determine, among the stored software file sets, exactly which one is actively running right now versus which one will load on the next reboot, important before performing an upgrade or rollback. For example, before rebooting the ELS-100 after a firmware upload, the admin would check kxswIndex to confirm the newly uploaded file set is correctly marked as next-boot(2) rather than accidentally leaving the old image selected.