It is called "rebooting"
One can find a reboot disc for Vista OS X from Microsoft. There are other makers of reboot disc for Vista OS X and sometimes they send a reboot disc in your order.
It's just a geeky way of saying restart the computer.
init 6 Other variations are 'reboot' and 'shutdown -r'
Reboot means to restart. To restart or reboot click the apple icon top left and then click Restart.
To get out of a "Safe Boot" on any Mac just restart (reboot) the computer and it will restart into the original OS.
Computers made by Apple, called Macs, use the Macintosh OS.
You can find information on how to reboot a computer that is running the Windows 8 OS online at the official Windows Microsoft website. You can also read the manual that came with the Windows 8 OS disc.
You have to reinstall Windows. Use you windows DVD and reinstall the OS. If you are uncertain, take help from a professional.
The 3rd book in the reboot series is called "Reboot: Rebel." It continues the story of Wren and Callum as they navigate challenges in the world of reboots.
If on a PC, create a new partition on your main hard drive. Install the second OS on the new partition. On your next reboot it should ask you which partition you wish to boot to.
Holding down the option key while starting up a Mac running Mac OS X enters the Startup Manager which will let you select where you want to boot from.
It's usually called a hypervisor, or virtual machine monitor.