I'm sure there is a way but honestly in my opinion the easiest thing to do to stop that is password protect the accounts and then they cant get on other accounts...
Start/Control Panel/Users/ Click on each individual user and click set password and then type one for each user that they know and then they wont know each other...
Also when you get to the screen with list of user when you start up you PC press Ctrl-Alt-Del twice you will see a different login screen,type Administrator
in the box that says user leave the password field emty,once in,create a password for the Administrator too! If you don't do this then your passwords are useless as administrators can remove password and do much more damage