C# Signature:

  [StructLayout(LayoutKind.Sequential)]
  public struct APPBARDATA
  {
    public static readonly int cbSize = Marshal.SizeOf(typeof(APPBARDATA));
    public IntPtr hWnd;
    public uint uCallbackMessage;
    public uint uEdge;
    public RECT rc;
    public int lParam;
  }

VB Signature:

  <StructLayout(LayoutKind.Sequential)> _
   Structure APPBARDATA
     Public cbSize As Integer
     Public hWnd As IntPtr
     Public uCallbackMessage As Integer
     Public uEdge As Integer
     Public rc As RECT
     Public lParam As Boolean
   End Structure

User-Defined Types:

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Notes:

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