An array of USB 'alternate settings' for each interface in the currently selected configuration (indicated by the CurrentConfigValue ...

An array of USB 'alternate settings' for each interface in the currently selected configuration (indicated by the CurrentConfigValue property). This array has one entry for each interface in the configuration. If the property, CurrentConfigValue, is zero (indicating the Device is not configured), the array is undefined. To understand how to parse this octet string, refer to the USB Specification.