How to limit several users' access to one machine
Several people use one computer. You can use Acronis OS Selector to limit their access to the computer.
A quite flexible password system is built into Acronis OS Selector. You can set separate passwords to the Boot Menu (this password is required every time the computer is booted) to each boot configuration. You can also set a special administration password (this one is required to start Setup or Disk Administrator).
Please note that this protection is not absolute, and it is better to use it along with other protection means that are built into operating systems.