...prevent mouvement of a form outside the desktop?

procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if Form1.Left <= 0 then Form1.Left := 0;
  if Form1.Top <= 0 then Form1.Top := 0;
  if Form1.Left >= Screen.Width - Form1.Width then
    Form1.Left := Screen.Width - Form1.Width;
  if Form1.Top >= Screen.Height - Form1.Height then
    Form1.Top := Screen.Height - Form1.Height;
end;

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