Пример с пояснением:

// GetConsoleWindow() => returns:
// "handle to the window used by the console
// associated with the calling process
// or NULL
// if there is no such associated console."
HWND consoleWindowHandle = GetConsoleWindow();

if( consoleWindowHandle ){
    cout << endl << "Setting up associated console window ON TOP !";
    SetWindowPos(
        consoleWindowHandle, // window handle
        HWND_TOPMOST, // "handle to the window to precede
                      // the positioned window in the Z order
                      // OR one of the following:"
                      // HWND_BOTTOM or HWND_NOTOPMOST or HWND_TOP or HWND_TOPMOST
        0, 0, // X, Y position of the window (in client coordinates)
        0, 0, // cx, cy => width & height of the window in pixels
        SWP_DRAWFRAME | SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW // The window sizing and positioning flags.
    );
    // OPTIONAL ! - SET WINDOW'S "SHOW STATE"
    ShowWindow(
        consoleWindowHandle, // window handle
        SW_NORMAL // how the window is to be shown
                  // SW_NORMAL => "Activates and displays a window.
                  // If the window is minimized or maximized,
                  // the system restores it to its original size and position.
                  // An application should specify this flag
                  // when displaying the window for the first time."
    );
    cout << endl << "Done.";
} else {
    cout << endl << "There is no console window associated with this app :(";
}

Ссылки: