Macs run OS X, most Linux distros, Windows, and various flavors of Unix. Sometimes all at the same time. Apple even provides Boot Camp so Mac users can dual boot from OS X to Windows (or whatever). An easier way to manage the multiple-bootup operation is with Boot Runner, an add-on utility which simply makes it easier to run multiple operating systems on a Mac.
Boot Runner uses a simple startup system which displays available operating systems on the Mac so a user can select the one needed at the moment. Or, Boot Runner can automatically startup with a specific OS according to a schedule.
Boot Runner can automatically login to a specific OS X account, launch a virtual machine host, and offers both custom login options and custom boot volume icons for Macs loaded up with multiple operating systems.
Who uses a multiple boot, multi-operating system setup on a Mac? Classrooms, government agencies, corporations, and IT departments. Boot Runner just makes it easier to manage multiple OS’s on a Mac, even to the point of providing custom branding and startup program information on the selection screen (both of which can also be managed remotely).
Lesser functionality is available for free in QuickBoot for the Mac.