No, no hablo de esa. La externa es la de la DLL. La interna, la que cité, es la que en teoría utiliza esa DLL.
La razón para no usarla es la que pone en el link:
https://msdn.microsoft.com/en-us/library/bb432200(v=vs.85).aspxThe functions and structures in Winternl.h are internal to the operating system and subject to change from one release of Windows to the next, and possibly even between service packs for each release. To maintain the compatibility of your application, you should use the equivalent public functions instead.
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