84     IN HANDLE Event OPTIONAL,
85     IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
86     IN PVOID ApcContext OPTIONAL,
90     IN PLARGE_INTEGER ByteOffset OPTIONAL,
91     IN PULONG Key OPTIONAL
99     IN HANDLE Event OPTIONAL,
100     IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
101     IN PVOID ApcContext OPTIONAL,
105     IN PLARGE_INTEGER ByteOffset OPTIONAL,
106     IN PULONG Key OPTIONAL
114     IN HANDLE Event OPTIONAL,
115     IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
116     IN PVOID ApcContext OPTIONAL,
119     IN PVOID InputBuffer OPTIONAL,
121     OUT PVOID OutputBuffer OPTIONAL,
130     IN HANDLE Event OPTIONAL,
131     IN PIO_APC_ROUTINE ApcRoutine OPTIONAL,
132     IN PVOID ApcContext OPTIONAL,
135     IN PVOID InputBuffer OPTIONAL,
137     OUT PVOID OutputBuffer OPTIONAL,
390     OUT PBOOLEAN OpenedReadonly OPTIONAL  in _OpenNtName()  argument
498     OUT PBOOLEAN OpenedReadonly OPTIONAL  in _OpenDriveLetter()  argument
817     OUT PBOOLEAN OpenedReadonly OPTIONAL,  in _Ext2OpenDevice()  argument
818     OUT unsigned *Errno OPTIONAL  in _Ext2OpenDevice()  argument