<Window x:Class="NewTouchTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" 
        TouchDown="Window_TouchDown" TouchMove="Window_TouchMove" TouchUp="Window_TouchUp">
    <Grid x:Name="AppGrid">
 
    </Grid>
</Window>

public partial class MainWindow : Window
{
    Brush[] ColorList = new Brush[] { Brushes.Black, Brushes.Yellow, Brushes.Turquoise, Brushes.Purple, Brushes.Orange, Brushes.Navy, Brushes.Pink, Brushes.Brown, Brushes.DarkKhaki };
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Window_TouchDown(object sender, TouchEventArgs e)
    {
        Border newTouch = new Border();
        TextBlock idText = new TextBlock();
        int id = e.GetTouchPoint(this).TouchDevice.Id;
        idText.Text = id.ToString();
        idText.Foreground = Brushes.White;
        newTouch.Child = idText;
        newTouch.Background = ColorList[id % ColorList.Length];
        newTouch.Width = 20;
        newTouch.Height = 20;
        newTouch.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
        newTouch.VerticalAlignment = System.Windows.VerticalAlignment.Top;
        AppGrid.Children.Add(newTouch);
        Point touchLoc = e.GetTouchPoint(this).Position;
        newTouch.RenderTransform = new TranslateTransform(touchLoc.X, touchLoc.Y);
    }

    private void Window_TouchMove(object sender, TouchEventArgs e)
    {
        foreach (UIElement child in AppGrid.Children)
        {
            if (child is Border)
            {
                TouchPoint touch = e.GetTouchPoint(this);
                if (((TextBlock)((Border)child).Child).Text == touch.TouchDevice.Id.ToString())
                {
                    Point touchLoc = touch.Position;
                    child.RenderTransform = new TranslateTransform(touchLoc.X, touchLoc.Y);
                    break;
                }
            }
        }
    }

    private void Window_TouchUp(object sender, TouchEventArgs e)
    {
        foreach (UIElement child in AppGrid.Children)
        {
            if (child is Border)
            {
                TouchPoint touch = e.GetTouchPoint(this);
                if (((TextBlock)((Border)child).Child).Text == touch.TouchDevice.Id.ToString())
                {
                    AppGrid.Children.Remove(child);
                    break;
                }
            }
        }
    }
}

<Window x:Class="MultitouchTest.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="800" Width="1200">
    <Canvas>
        <Rectangle Canvas.Left="-20" Canvas.Top="0" Height="20" Name="Touch1" Stroke="Black" Fill="Black"  Width="20" />
        <Rectangle Canvas.Left="-20" Canvas.Top="0" Height="20" Name="Touch2" Stroke="Red" Width="20" Fill="Red" />
    </Canvas>
</Window>

public partial class Window1 : Window
{
    #region Class Variables
 
    private int Touch1ID = 0;    // id for first touch contact
    private int Touch2ID = 0;    // id for second touch contact
 
    #endregion
 
    #region P/Invoke
 
    // just a little interop.  it's different this time!
    [DllImport("user32.dll")]
    public static extern bool SetProp(IntPtr hWnd, string lpString, IntPtr hData);
 
    #endregion
 
    #region Constructors/Initialization
 
    public Window1()
    {
        InitializeComponent();
 
        // here's the first thing you need to do.  upon window load, you want to set the tablet
        // property to receive multi-touch data.  you need to the window loaded to ensure the handle is created.
        this.Loaded += new RoutedEventHandler(
           delegate(object sender, RoutedEventArgs args)
           {
               var source = new WindowInteropHelper(this);
 
               SetProp(source.Handle,
                   "MicrosoftTabletPenServiceProperty", new IntPtr(0x01000000));
 
           });
 
        // then, simply subscribe to the stylus events like normal.  you'll get an event for each contact.
        // so, when you move both fingers, you get a StylusMove event for each individual finger
        this.StylusDown += new StylusDownEventHandler(Window1_StylusDown);
        this.StylusMove += new StylusEventHandler(Window1_StylusMove);
        this.StylusUp += new StylusEventHandler(Window1_StylusUp);
    }
 
    #endregion
 
    #region Touch Events
 
    void Window1_StylusDown(object sender, StylusDownEventArgs e)
    {
        Point p = e.GetPosition(this);   // get the location for this contact
 
        // attribute an id with a touch point
        if (Touch1ID == 0)
        {
            Touch1ID = e.StylusDevice.Id;
            // move the rectangle to the given location
            Touch1.SetValue(Canvas.LeftProperty, p.X - Touch1.Width / 2);
            Touch1.SetValue(Canvas.TopProperty, p.Y - Touch1.Height / 2);
        }
        else if (Touch2ID == 0)
        {
            Touch2ID = e.StylusDevice.Id;
            // move the rectangle to the given location
            Touch2.SetValue(Canvas.LeftProperty, p.X - Touch2.Width / 2);
            Touch2.SetValue(Canvas.TopProperty, p.Y - Touch2.Height / 2);
        }
    }
 
    void Window1_StylusMove(object sender, StylusEventArgs e)
    {
        Point p = e.GetPosition(this);
        // determine which contact this belongs to
        if (Touch1ID == e.StylusDevice.Id)
        {
            // move the rectangle to the given location
            Touch1.SetValue(Canvas.LeftProperty, p.X - Touch1.Width / 2);
            Touch1.SetValue(Canvas.TopProperty, p.Y - Touch1.Height / 2);
        }
        else if (Touch2ID == e.StylusDevice.Id)
        {
            // move the rectangle to the given location
            Touch2.SetValue(Canvas.LeftProperty, p.X - Touch2.Width / 2);
            Touch2.SetValue(Canvas.TopProperty, p.Y - Touch2.Height / 2);
        }
    }
 
    void  Window1_StylusUp(object sender, StylusEventArgs e)
    {
         // reinitialize touch id and hide the rectangle
        if (e.StylusDevice.Id == Touch1ID)
        {
            Touch1.SetValue(Canvas.LeftProperty, -Touch1.Width);
            Touch1ID = 0;
        }
        else if (e.StylusDevice.Id == Touch2ID)
        {
            Touch2.SetValue(Canvas.LeftProperty, -Touch2.Width);
            Touch2ID = 0;
        }
    }
 
    #endregion
}