Generally, a boot manager allows for every operating system to be installed to a separate partition, thus limiting the chances of potential conflicts. Therefore, a boot manager is a must for any similar situation. Without a boot manager, the boot sequence chooses the same OS over and over again and boots to it.
For instance, one may want to have Windows, a few Linux distributions and even a Mac OS X deployed on the same system. First things first, boot managers resolve the problem that many users interfere with whenever they want to install different OSes on their PC. Grub2Win 2.3.8.1 | 1.43 MB | Grub2Win provides you with a boot manager that allows you to boot from various operating systems every single time you power your computer on.