210 struct smi {  struct
211     DWORD smi_VersionNo;  argument
212     DWORD smi_Reserved1;  argument
213     DWORD smi_Reserved2;  argument
214     LPVOID ntstatus;	/* address of NT status block*/
215     LPVOID  lpvInBuffer;        /* address of buffer for input data*/
216     DWORD  cbInBuffer;  /* size of input buffer*/
217     LPVOID  lpvOutBuffer;       /* address of output buffer*/
218     DWORD  cbOutBuffer; /* size of output buffer*/
219     LPDWORD  lpcbBytesReturned; /* address of actual bytes of output*/
220     LPOVERLAPPED  lpoOverlapped;         /* address of overlapped structure*/