Hide external app from taskbar

private const int SW_HIDE = 0x00;
private const int SW_SHOW = 0x05;
private const int WS_EX_APPWINDOW = 0x40000;
private const int GWL_EXSTYLE = -0x14;
private const int WS_EX_TOOLWINDOW = 0x0080;

  private static void HideAppinTaskBar()
  {
  var Handle = FindWindowByCaption(IntPtr.Zero, "Untitled - Notepad");
  ShowWindow(Handle, SW_HIDE);
  SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) |     WS_EX_TOOLWINDOW);
  ShowWindow(Handle, SW_SHOW);
  }

Source: stackoverflow.com

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