RtlSetGroupSecurityDescriptor - NtDoc

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

NTSYSAPI
NTSTATUS
NTAPI
RtlSetGroupSecurityDescriptor(
    _Inout_ PSECURITY_DESCRIPTOR SecurityDescriptor,
    _In_opt_ PSID Group,
    _In_ BOOLEAN GroupDefaulted
    );

#endif

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This function is documented in Windows Driver Kit.