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copied!<ol> <li><p>Create a WPF window that is transparent and topmost (EDIT: do not maximize window)</p> <pre><code><Window ... Background="#00000000" Topmost="True" ShowInTaskbar="False" WindowStyle="None" AllowsTransparency="True" ResizeMode="NoResize"> </code></pre></li> <li><p>(NEW) Use GetWindowRect to get the location and size of the slide show window</p> <pre><code>[DllImport("user32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect); [StructLayout(LayoutKind.Sequential)] private struct RECT { public int Left; public int Top; public int Right; public int Bottom; } </code></pre></li> <li><p>Place the transparent window over the PowerPoint slideshow window</p> <pre><code>settings = presentation.SlideShowSettings; slideshowWindow = settings.Run(); RECT rect = new RECT(); GetWindowRect(new IntPtr(slideshowWindow.HWND), ref rect); overlayWindow.Left = rect.Left; // EDIT: do not use slideshowWindow.Left, etc. overlayWindow.Top = rect.Top; overlayWindow.Width = rect.Width; overlayWindow.Height = rect.Height; </code></pre></li> <li><p>Put a Canvas into the WPF window and add Polyline objects to it as needed. Text marker lines could be like this:</p> <pre><code>line = new Polyline { Opacity = 0.8, Stroke = new SolidColorBrush(Colors.Yellow), StrokeThickness = 20 }; this.canvas.Children.Add(line); </code></pre> <p>Add points to line.Points as needed. Call <code>this.canvas.Children.Clear()</code> to clear all your drawings.</p></li> </ol> <p>It's a workaround but I'd say your best shot.</p>

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