A standalone Windows XP professional box can be a vulnerable target for compromise because it is not regulated by group policies and it is basically controlled by a local administrator account.
Let’s say if more than one user uses a single XP professional box atdifferent times and we want to make sure that folks can logon only after they give the 3 finger salute (Ctrl-Alt-Del) on that box.
Enabling the option that requires users to press Ctrl-Alt-Del to logon is quite straight forward.
1.Go to Start>Run>control userpasswords2
2.Go to Advanced tab and check mark Require users to press Ctrl+Alt+Del
3.All done.
Peace.