Is it possible to boot Linux with user space applications from file/image on disk?

I can copy content of any live image (for example from http://www.debian.org/CD/live/) to separate partition with any FS supported by grub and boot from it.

But how about booting from file instead of partition?

During searching I found that users name this as "Poor Man's Install" but most of them use partitions instead of single file....


MEMDISK will allow you to boot from a disk image.

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