It is simple and close to hand.
init 6 Other variations are 'reboot' and 'shutdown -r'
If you run a Linux system, you rarely have to reboot your system. However, for Windows systems, rebooting is common. Under Windows systems, rebooting is primarily used to finish installing updates and protect the system from data corruption if a fatal error is encountered.
Cold boot is the term used for starting the computer from the power off condition.
Reboot the computer; while it is rebooting, press the F8 key repeatedly and an option the start in Safe Mode will appear.
The sequence Control-Alt-Delete, used to reboot a computer under distress, was created for the IBM PC by David Bradley.
Hardware is usually what is used to control a computer but you can download software that would enable you to speed up the computer.
If you mean - can you access the previous users information - it's possible if they haven't wiped the hard-drive or performed a factory reset before the sale.
Control - Alt - Delete
Turn it on when it is completely off.
It is a CD the has some form of Linux, an operating system for your computer (Microsoft Windows is an operating system). There are CDs of Linux that are just used to install Linux, or there are LiveCDs that you just put in and reboot. Linux will be running without effecting the rest of the computer.
PLATFORM
I have no idea. Why would I want to freeze my computer?