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BOOL port_open(unsigned long ip)
{
	SOCKET s;
	SOCKADDR_IN sin;
	unsigned long blockcmd=1;
	timeval t;
	int i;
	FD_SET rset;
	s=socket(AF_INET,SOCK_STREAM,0);
	if (s==INVALID_SOCKET) return INVALID_SOCKET;
	sin.sin_family=AF_INET;
	sin.sin_addr.S_un.S_addr=ip;
	sin.sin_port=htons(5900);
	ioctlsocket(s,FIONBIO,&blockcmd);
	connect(s,(LPSOCKADDR)&sin,sizeof(sin));
	FD_ZERO(&rset);
	FD_SET(s,&rset);
	t.tv_sec=5;
	t.tv_usec=0;
	i=select(0,0,&rset,0,&t);
	closesocket(s);
	if (i<=0) {
		return FALSE;
	} else {
		return TRUE;
	}
}