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By default, the tracing components in this version of the Windows Driver Kit (WDK) search for NULL strings in the arguments that you pass in functions. As a result, you do not have to verify each argument to prevent NULL strings from causing an exception.
In earlier versions of the WDK, the WPP_CHECK_FOR_NULL_STRING macro performed this function. If you build your kernel-mode driver or user-mode application by using this version of the WDK, you can remove the macro from your source code.