Again with CAsyncSocket

I'm again with my attemp of implement a CAsyncSocket class to my
project.

I started from 0 again and have a class (MySocket:public CAsyncSocket)
that has to manage the connections.
The constructor creates the server socket:

MySocket::MySocket()
{
    //CAsyncSocket* pServer = new CAsyncSocket;
    this->numclients = 0;
    int nPort = 15000;
    int ret = this->Create( 15000 );
    if( Listen()==FALSE )
    {
               //ERROR
    }
    else
    {
        //NO ERROR
    }
}

This opens my server and starts listening connections:

void MySocket::OnAccept(int nErrorCode)
{
        CAsyncSocket* client = new CAsyncSocket();

    if( Accept( *client ) )
    {
        CString strIP;
        UINT port;
        this->GetSockName( strIP, port );
        AfxMessageBox( _T("Client connected: " + strIP ) );
    }
    else
    {
        AfxMessageBox( "ERROR");
    }

    CAsyncSocket::OnAccept(nErrorCode);
}

Here comes my first doubt. To accept multiple connections... I'm doing
correctly?? I tried and every client seems to connect.

Now, for the sending data part:
I use Send( "SOME STRING", strlen("SOME STRING") );

But this does not sends anything (I think).

I've readed the MSDN examples, http://www.flounder.com/mvp_tips.htm,
googling and none clear my mind.

PD: I know that exist TRACE() but I use temporaly AfxMessageBox for
now.