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

// Only applies to segment heap. Applies pointer obfuscation which is
// generally excessive and unnecessary but is necessary for certain insecure
// heaps in win32k.
// Specifying HEAP_CREATE_HARDENED prevents the heap from using locks as
// pointers would potentially be exposed in heap metadata lock variables.
// Callers are therefore responsible for synchronizing access to hardened heaps.
#define HEAP_CREATE_HARDENED 0x00000200


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