screen lock

[Bruno Wolff III]

On Tue, Nov 23, 2010 at 09:58:58 +0000,
  Patrick Dupre <pd520 at york.ac.uk> wrote:
> On Mon, 22 Nov 2010, sguazt wrote:
> 
> Thank, you are right. I need to laod gnome-screensaver.
> It is not a service. So, when/where should I start it ?

The system->Preferences->startup applications menu.
There are two screen savers one uses the screensaver checkbox, the other
the xscreensaver-autostart checkbox. I am not sure what the difference
is between the two, or which is more likely to be installed by default.