#ifndef _NTWMI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
//NTSYSAPI
//ULONG
//NTAPI
//EtwEventRegister(
// _In_ LPCGUID ProviderId,
// _In_opt_ PENABLECALLBACK EnableCallback,
// _In_opt_ PVOID CallbackContext,
// _Out_ PREGHANDLE RegHandle
// );
NTSYSAPI
ULONG
NTAPI
EtwEventUnregister(
_In_ REGHANDLE RegHandle
);
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This function is documented in Windows SDK.