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uses Registry;

procedure TForm1.Button2Click(Sender: TObject);
var
  i: integer;
  reg: TRegistry;
begin
  reg := TRegistry.Create(KEY_READ);
  reg.RootKey := HKEY_CURRENT_USER;
  if reg.KeyExists('Software\\Microsoft\\Windows\\DWM\\') then
    i := reg.readinteger('EnableAeroPeek');
  showmessage(inttostr(i));
  reg.CloseKey;
  reg.free;
end;