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Identifier for a Windows GUI element (AutomationElement HashCode and RuntimeID)
using System.Window.Automation;
private AutomationElement element;
System.Drawing.Point mouse = System.Windows.Forms.Cursor.Position;
this.element = AutomationElement.FromPoint(new System.Windows.Point(mouse.X, mouse.Y));

[DllImport("User32.dll")]
    public static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);

private string GetClassName(IntPtr hWnd)
    {
        StringBuilder sb = new StringBuilder(256);
        this.GetClassName(hWnd, sb, 256);
        return sb.ToString();
    }