LOWORD - NtDoc

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// Macros that are no longer used in this header but which clients may
// depend on being defined here.
//
#ifndef LOWORD

#define LOWORD(l)     ((WORD)(((DWORD_PTR)(l)) & 0xffff))

#endif
#endif
#endif
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