http://cdimage.debian.org/*-update-*.jigdo images?

[David Christensen <dpchrist@holgerdanske.com>]

debian-user:

I use jigdo to obtain Debian ISO images.  Tonight, I'm getting:

    debian-6.0.4-amd64-CD-1.jigdo
    debian-6.0.4-amd64-CD-1.template

Plus the four checksum and four signature files at:

    http://cdimage.debian.org/debian-cd/6.0.4/amd64/jigdo-cd/


I've also noticed "*-update-*" files in the same directory:

    debian-update-6.0.4-amd64-CD-1.jigdo
    debian-update-6.0.4-amd64-CD-1.template
    ...
    debian-update-6.0.4-amd64-CD-11.template


I've STFW and have some guesses (mount the ISO's via /etc/fstab and 
loopback, add entries to /etc/apt/sources.list, run apt-get update, 
etc.), but is there anything I can RTFM?  Should I get all 11 images, or 
just #11?


TIA,

David