High Quality Content by WIKIPEDIA articles! xOSL (meaning Extended Operating System Loader) is the name of a bootloader, which is a program product class that launches operating systems from a bootable device such as a hard disk or floppy drive. THe letters are an acronym that stand for eXtended Operating System Loader. XOSL was originally developed by Geurt Vos. XOSL provides a graphical user interface which allows the user to set up and boot a computer into any of 24 different operating systems. XOSL is nondenominational bootloader, owing allegiance to no system in particular, and booting them all equally well. THe xOSL interface installs and uninstalls easily. THe xOSL program poses very little risk of permanent damage to existing data. REmoving the program can be accomplished with the DOS command fdisk /MBR, which returns the disk to its original boot configuration.