void main()
{
WSADATA wsaData;
if ( 0 == WSAStartup( MAKEWORD( 2, 0 ), &wsaData ) )
{
SOCKET s1 = socket( PF_INET, SOCK_DGRAM, 0 );
SOCKET s2 = socket( PF_INET, SOCK_DGRAM, 0 );
if ( s1 != SOCKET_ERROR && s2 != SOCKET_ERROR )
{
sockaddr_in addr1, addr2;
memset( &addr1, 0, sizeof(addr1) );
memset( &addr2, 0, sizeof(addr2) );

addr1.sin_family = AF_INET;
addr1.sin_port = htons( 5000 );
addr1.sin_addr.s_addr = INADDR_ANY;

addr2.sin_family = AF_INET;
addr2.sin_port = htons( 5001 );
addr2.sin_addr.s_addr = INADDR_ANY;

if ( bind( s1, (sockaddr *)&addr1, sizeof(addr1) ) != SOCKET_ERROR &&
bind( s2, (sockaddr *)&addr2, sizeof(addr2) ) != SOCKET_ERROR )
{
sockaddr_in ad;
int adlen = sizeof(ad);

ad.sin_family = AF_INET;
ad.sin_port = htons( 5001 );
ad.sin_addr.s_addr = inet_addr( "127.0.0.1" );

char str1[ 14 ] = "Hello, World!";
char str2[ 14 ];

sendto( s1, str1, 14, 0, (sockaddr *)&ad, adlen );
recvfrom( s2, str2, 14, 0, (sockaddr *)&ad, &adlen );

printf( "%s\n", str2 );
}
closesocket( s1 );
closesocket( s2 );
}
WSACleanup();
}
getchar();
}