In Mac OS X 10.4, I had it set up so there was a little lock box up by the clock. When I click it, and then press lock screen from the drop down menu, it will black the screen out and require you to enter a password to get back on. THe thing I liked about this was it did not log off the internet or close any of my apps, it just locked the screen from anyone doing anything and from seeing anything. I just installed Leopard and I forgot how to set it back up like that. How do I do it?