Tied up with Threads

[Albatross]

I've got a button on a dialog window which sends
off two strings over the net. But I'd like to stop
the process after the first string in order to listen
if a response has come.

void MyDlg::OnBtn1()
{
   SendString(s1);
   
// wait for an answer// 

   SendString(s2);
}
.
.
void MyDlg::OnResponseArrived()
{
//  let the OnBtn1() routine continue //
}

1. I can't put //wait for an answer// into a worker thread because
the rest of the OnBtn1() thread will continue anyway.

2. And a worker thread is out of the question because the
MyDlg object is inaccessible.

3. A CWinThread object can't work because how can it
communicate with MyDlg?
With SendMessage from a CWinThread object
MyDlg will wait for OnBtn1() to finish before reacting to
SendMessage anyway.


Any ideas?