uses .., ShellApi;

var
  AppBarData  : TAppBarData;
  bAlwaysOnTop: Boolean; {Поверх окон}
  bAutoHide   : boolean; {Авт. убирать с экрана}
  ClRect      : TRect;   {Клиентские области}
  Rect        : TRect;
  Edge        : UInt;    {Местоположение TaskBar}

procedure DetectTaskBar;
begin
  AppBarData.hWnd   := FindWindow('Shell_TrayWnd', nil);
  AppBarData.cbSize := sizeof(AppBarData);
  bAlwaysOnTop      := (SHAppBarMessage(ABM_GETSTATE, AppBardata) and  ABS_ALWAYSONTOP) < >  0;
  bAutoHide         := (SHAppBarMessage(ABM_GETSTATE, AppBardata) and  ABS_AUTOHIDE) < > 0;
  GetClientRect(AppBarData.hWnd, ClRect.rc);
  GetWindowRect(AppBarData.hwnd, rect);
  if (Rect.top >  0) Then
   Edge := ABE_BOTTOM
  else
  if (Rect.Bottom <  Screen.Height) Then
   Edge := ABE_TOP
  else
  if Rect.Right <  Screen.Width Then
   Edge := ABE_LEFT
  else
   Edge := ABE_RIGHT;
end;