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Use the VERIFIER_DDK_EXTENSIONS environment variable to activate the Call Usage Verifier (CUV) tool.
When this variable is defined and set equal to a nonzero value, your driver will be built with CUV checking. This is only available in the build environments for Windows XP and later versions of Windows.
This variable may be set by default in some checked build environment windows. Use the set command to determine if this variable is set in the window you are using.
For details, see Call Usage Verifier.
Caution The version of your driver that you release to your customers must not be built with CUV. Drivers that are built with CUV include ddk_ext.lib, which makes them larger and slower. Generally, you should only activate CUV when building drivers in the checked build environment.