unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs,shellapi, StdCtrls;
type
 TForm1 = class(TForm)
 Button1: TButton;
 procedure Button1Click(Sender: TObject);
 private
 { Private declarations }
 public
 { Public declarations }
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var 
AB : TAppBarData;
sPos:string;
begin
AB.cbSize := sizeof(AB);
SHAppBarMessage(ABM_GETTASKBARPOS, AB);
 case AB.uEdge of
 0:sPos:='Left';
 1:sPos:='Top';
 2:sPos:='Right';
 3:sPos:='Bottom';
 end;
ShowMessage('Taskbar is at the '+sPos+' Position.');
end;
end.