WinStationShutdownSystem - NtDoc

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

NTSYSAPI
BOOLEAN
NTAPI
WinStationShutdownSystem(
    _In_opt_ HANDLE ServerHandle,
    _In_ ULONG ShutdownFlags // WSD_*
    );

#endif

View code on GitHub

This function is a wrapper over an RPC method documented in the [MS-TSTS] specification.