posting messages from child to parent

I have a program that spins off 2 threads and then waits for them to complete.
AS you see in the code below, I wait using the MsgWaitForMultipleObjects function.

In my ThreadFunc, I create a window and draw some primitives. It has its message handler just handles the WM_DESTROY message.
When I close the window, I want the child thread to post a message to the parent thread. I dont have a Window created in the parent. How can I do this?

For ex: Can I repost the WM_DESTROY message from the Child threads's Message handler to the parent?

Code:

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INT WINAPI wWinMain( HINSTANCE hInst, HINSTANCE, LPWSTR, INT )
{
        DWORD *pdwThreadIds, dwThrdParam = 1;
        HANDLE *phThreads;
        UINT uiNumThreads=2;

        pdwThreadIds = new DWORD [uiNumThreads];
        phThreads        = new HANDLE [uiNumThreads];

        for (UINT uiCnt=0; uiCnt < uiNumThreads; uiCnt++)
        {
                phThreads[uiCnt] = CreateThread(
                                NULL,  0,                                                                          (LPTHREAD_START_ROUTINE)ThreadFunc        ,                                        &dwThrdParam,             
                                0,                       
                                &pdwThreadIds[uiCnt]); 
 
                if (phThreads[uiCnt] == NULL)
                {
                        printf( "CreateThread failed (%d)\n", GetLastError() );
                        exit(0);
                }
        }

  // The message loop lasts until we get a WM_QUIT message,
    // upon which we shall return from the function.
        UINT uiNum=uiNumThreads;
        MSG msg ;
    while (uiNum)
    {
        // block-local variable
        DWORD result ;

        // Read all of the messages in this next loop,
        // removing each message as we read it.
        while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            // If it is a quit message, exit.
            if (msg.message == WM_QUIT) 
                return 1;
            // Otherwise, dispatch the message.
            DispatchMessage(&msg);
        } // End of PeekMessage while loop.

        // Wait for any message sent or posted to this queue
        // or for one of the passed handles be set to signaled.
        result = MsgWaitForMultipleObjects(uiNum, phThreads,
                FALSE, INFINITE, QS_ALLINPUT);

        // The result tells us the type of event we have.
        if (result == (WAIT_OBJECT_0 + uiNumThreads))
        {
            // New messages have arrived.
            // Continue to the top of the always while loop to
            // dispatch them and resume waiting.
            continue;
        }
        else
        {
            // One of the handles became signaled.
            //DoStuff (result - WAIT_OBJECT_0) ;
            UINT temp = result - WAIT_OBJECT_0;
            CloseHandle( phThreads[temp] );
            uiNum-=1;
                       
        } // End of else clause.
    } // End of the always while loop.

}

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