RtlQueryAtomInAtomTable - NtDoc

#ifndef _NTRTL_H

NTSYSAPI
NTSTATUS
NTAPI
RtlQueryAtomInAtomTable(
    _In_ PVOID AtomTableHandle,
    _In_ RTL_ATOM Atom,
    _Out_opt_ PULONG AtomUsage,
    _Out_opt_ PULONG AtomFlags,
    _Inout_updates_bytes_to_opt_(*AtomNameLength, *AtomNameLength) PWSTR AtomName,
    _Inout_opt_ PULONG AtomNameLength
    );

#endif
View code on GitHub