Two adults, two grand kids. Lots of stuff I would rather the kids not see, but two adults use this computer. Does any of my learned friends use the new fingerprint recognition system of starting up the computer? Will the one gadget you put your finger on work for two people? Other than just going ahead and throwing the machine in the fishing hole how else could I be positive that no one else can start up the computer? What brand or system would you recomend for marginally computer literate senion citizens? Thanks, Grandma & Poppy