The altitude the component's system driver should use.
property Altitude: Integer read get_Altitude write set_Altitude;
This property specifies the altitude that the component's system driver should use. A driver's altitude determines its absolute position in the stack of filter drivers; drivers with higher altitudes are attached towards the top of the stack, closer to user mode, which allows them to process requests earlier.
Registry filter drivers are not required to specify an altitude; and this property's default value of 0 is interpreted as "no altitude". However, registry filter drivers that don't specify an altitude will always be attached near the top of the filter driver stack, which may not be desirable. Please refer to the Driver Altitudes topic for more information.