#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_VISTA)
typedef _Function_class_(RTL_RUN_ONCE_INIT_FN)
LOGICAL NTAPI RTL_RUN_ONCE_INIT_FN(
_Inout_ PRTL_RUN_ONCE RunOnce,
_Inout_opt_ PVOID Parameter,
_Inout_opt_ PVOID *Context
);
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This callback function is documented in Windows Driver Kit.