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RootFs' defines the main directories and their contents in Linux operating systems, including Puppy. In frugal installation it is held in a series of compressed files BaseSFS, Pup SaveFile and other SFSs.
Any media that is mounted should have a directory here including hard-drive partitions, cds, usbs and archive files such as SquashFS.
Installed applications with a menu entry will have a link file here.