Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTWMI_H

// For ETW_SET_TIMER_EVENT, Period must always be defined as the last member as
// the same structure is used for periodic and one-shot timers.  In the latter
// case, the payload size is truncated to ignore the period field.
typedef struct _ETW_SET_TIMER_EVENT
    ULONG64 ExpectedDueTime;
    ULONG_PTR TimerAddress;
    USHORT TargetProcessorGroup;
    UCHAR TargetProcessorIndex;
    UCHAR Flags;
    ULONG Period;
    UCHAR EncodedDelay;
    UCHAR Reserved0;
    USHORT Reserved1;


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