Is there a way to install Debian iso's from an existing installation onto a USB connected drive?

[Albretch Mueller <lbrtchx@gmail.com>]

 something like:

 1) download the iso's

 2) go: <some application> /dev/sdb

 where "/dev/sdb" is the device a USB disk is linked to

 then you would plug the disk on your computer and take it from there

 For that I used to burn live DVD but there should be a better way

 lbrtchx