#ifndef _NTWMI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#ifndef EVENT_DESCRIPTOR_DEF
typedef struct _EVENT_DESCRIPTOR
{
USHORT Id;
UCHAR Version;
UCHAR Channel;
UCHAR Level;
UCHAR Opcode;
USHORT Task;
ULONGLONG Keyword;
} EVENT_DESCRIPTOR, *PEVENT_DESCRIPTOR;
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This structure is documented in Windows SDK.