It is not clear if you want all 10 people to be able to log on to the computer.
If so just give each of them a userid AND A PASSWORD.
Then when they get to the Welcome screen they will need to enter their password before they can log on.
You do not NEED to set up the Ctrl+Alt+Delete if you give each person a password.
This is how I have XP Home set up in my house. Me, my wife, and both children need to put in their password before they can log on.
Make sure only YOU have administrator privilages, the rest should have limited privilages.
If THEY have Administrator priviliges they could change all the passwords, including your password