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As its name suggests, GAG is a boot manager, a program that does nothing more than start the computer, and allows you to select one of the operating systems that are installed on the disk.
It is a very useful tool for those that have two operating systems installed on their computer, such as Windows and Linux.
GAG can boot from 9 different operating systems, no matter the disk or partition that they are on, or the type of partition (primary or extended).
GAG does not need it's own partition, so it is installed on the first sector of the hard drive. Also, it includes settings to define a default operating system or to set a password to restrict the access to any OS.
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2 reviews 
Comments
It seems to me the most suitable way to achieve that several operating systems can be installed, I am still testing it, I have done it with others of another type but they fail or are taken as viruses...