Afficher une Form en plein écran

{Comme dans un jeu, affiche la form en plein écran et rendre les touches système inaccessibles}

procedure TForm1.FormCreate(Sender: TObject);
var
HTaskbar: HWND;
OldVal: LongInt;
begin
try
HTaskBar := FindWindow('Shell_TrayWnd', nil);
SystemParametersInfo(97, Word(True), @OldVal, 0);
EnableWindow(HTaskBar, False);
ShowWindow(HTaskbar, SW_HIDE);
finally
with FORM1 do begin
BorderStyle := bsNone;
FormStyle := fsStayOnTop;
Left := 0;
Top := 0;
Height := Screen.Height;
Width := Screen.Width;
end;
end {FINALLY}
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
var
HTaskbar: HWND;
OldVal: LongInt;
begin
HTaskBar := FindWindow('Shell_TrayWnd', nil);
SystemParametersInfo(97, Word(False), @OldVal, 0);
EnableWindow(HTaskBar, True);
ShowWindow(HTaskbar, SW_SHOW);
end;