Install to USB without rebooting?

[Cybe R. Wizard]

NoOp <glgxg at sbcglobal.net>  said:
> So then perhaps you are wishing to install from the ISO instead?
> 
> Perhaps these forum posts will help:
> http://ubuntuforums.org/showthread.php?t=28948

Although pretty old I'm sure these instructions will work well.  I
might try it this weekend if it rains my outdoor activities out.
(Hoary Hedgehog?  that's positively ancient!)

But all these various instructions involve a reboot to access the
installation process, no?  Why can't I, say, open a terminal and
install (whether from CD, USB or .iso) to an unused drive or partition/
partitions on my box without having to stop using my running system?
Please understand that you shouldn't use up a lot of your time on
this, it is mainly intellectually exercising for me, not a necessity at
all.  I'm just playing!

Cybe R. Wizard
-- 
Nice computers don't go down.
	Larry Niven, Steven Barnes
		"The Barsoom Project"