An application can use the WinPostMsg function to post a message to a window. The message goes to the window's message queue. The following code fragment posts the WM_QUIT message.

    HWND hwnd;

    if (!WinPostMsg(hwnd, WM_QUIT, NULL, NULL)){

        /* Message was not posted. */
    }

The WinPostMsg function returns FALSE if the queue is full, and the message cannot be posted.