Altitude of the driver in MiniFilter mode

The altitude is a supposedly unique identifier of the minifilter driver which defines the order of the filter drivers in the filter stack. The detailed information about altitudes can be found on "Load Order Groups and Altitudes for Minifilter Drivers" MSDN article.

You MUST request your own altitude for your product as described in Altitude Request topic in MSDN to ensure that the driver altitude doesn't conflict with other drivers.