User-mode Linux

User-mode Linux [1] allows you to run multiple Linux processes on a separated process-level. How is User-mode Linux different?

[from the online documentation] \”Normally, the Linux Kernel talks straight to your hardware (video card, keyboard, hard drives, etc), and any programs which run ask the kernel to operate the hardware, like so:\”
\"User-mode
\”The User Mode Linux Kernel is different; instead of talking to the hardware, it talks to a \’real\’ Linux kernel, like any other program. Programs can then run inside User-Mode Linux as if they were running under a normal kernel, like so:\”
\"User-mode
It might be an alternative to Vmware under some circumstances [2]. This paper might help to install UML too [3].

[1] http://user-mode-linux.sourceforge.net
[2] http://www.vmware.com
[3] http://project.honeynet.org/papers/uml/

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