Désactiver l'écran de veille dans vos applications

interface
...
private
procedure AppMessage( var msg: TMsg; var handled: boolean);
...

implementation

...

procedure TForm1.AppMessage( var msg : TMsg; var handled : boolean);
begin
if (Msg.Message = WM_SYSCOMMAND) and (Msg.wParam = SC_SCREENSAVE) then
Handled := true;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage := AppMessage;
end;