Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H
// Hash tables
// begin_ntddk

typedef struct _RTL_DYNAMIC_HASH_TABLE
    // Entries initialized at creation.
    ULONG Flags;
    ULONG Shift;

    // Entries used in bucket computation.
    ULONG TableSize;
    ULONG Pivot;
    ULONG DivisorMask;

    // Counters.
    ULONG NumEntries;
    ULONG NonEmptyBuckets;
    ULONG NumEnumerators;

    // The directory. This field is for internal use only.
    PVOID Directory;

// end_ntddk

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