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   // This is a Winsock server that is listening on a port.

   // When a client connects, the server spawns a child process and
   // passes the socket handle to the child.
   // The child can use this socket handle to interact with the
   // client and the parent is free to go back to waiting for
   // other clients to connect.

   OrigSock=accept(listen_socket,(struct sockaddr *)&from,&fromlen);

   if (OrigSock == INVALID_SOCKET)  {
      fprintf(stderr,"accept failed %d\n",GetLastError());
      return -1;
   }
   {
      STARTUPINFO si;
      PROCESS_INFORMATION pi;
      char argbuf[256];

      memset(&si,0,sizeof(si));

      // 
      // Duplicate the socket OrigSock to create an inheritable copy.
      // 
      if (!DuplicateHandle(GetCurrentProcess(),
            (HANDLE)OrigSock,
            GetCurrentProcess(),
            (HANDLE*)&DuplicateSock,
            0,
            TRUE, // Inheritable
            DUPLICATE_SAME_ACCESS)) {

         fprintf(stderr,"dup error %d\n",GetLastError());
         return -1;
      }
      // 
      // Spawn the child process.
      // The first command line argument (argv[1]) is the socket handle.
      // 

      wsprintf(argbuf,"child.exe %d",DuplicateSock);
      if (!CreateProcess(NULL,argbuf,NULL,NULL,
               TRUE, // inherit handles
               0,NULL,NULL,&si,&pi) ){
         fprintf(stderr,"createprocess failed %d\n",GetLastError());
         return -1;
      }

      // 
      // On Windows 95, the parent needs to wait until the child
      // is done with the duplicated handle before closing it.
      // 
      WaitForSingleObject(pi.hProcess, INFINITE);
   }
   // 

   // The duplicated socket handle must be closed by the owner
   // process--the parent. Otherwise, socket handle leakage
   // occurs. On the other hand, closing the handle prematurely
   // would make the duplicated handle invalid in the child. In this
   // sample, we use WaitForSingleObject(pi.hProcess, INFINITE) to
   // wait for the child.
   // 
   closesocket(OrigSock);
   closesocket(DuplicateSock);
				

   main(int argc, char *argv[]){
      SOCKET Sock;

      /* WSAStartup etc. */ 
      if (2 == argc){
         Sock = atoi(argv[1]);   // use Sock
      }
   }