typedef struct 
{ 
   OVERLAPPED oOverlap; 
   HANDLE hPipeInst; 
   TCHAR chRequest[BUFSIZE]; 
   DWORD cbRead;
   TCHAR chReply[BUFSIZE];
   DWORD cbToWrite; 
   DWORD dwState; 
   BOOL fPendingIO; 
} PIPEINST, *LPPIPEINST; 

PIPEINST Pipe[INSTANCES];

int _tmain(VOID) 
{
fSuccess = ReadFile( 
               Pipe[i].hPipeInst, 
               Pipe[i].chRequest, 
               BUFSIZE*sizeof(TCHAR), 
               &Pipe[i].cbRead, 
               &Pipe[i].oOverlap); 
}

int _tmain(VOID) 
{
PIPEINST Pipe[INSTANCES];

fSuccess = ReadFile( 
               Pipe[i].hPipeInst, 
               Pipe[i].chRequest, 
               BUFSIZE*sizeof(TCHAR), 
               &Pipe[i].cbRead, 
               &Pipe[i].oOverlap); 

printf("%d \n",GetLastError());
}