[xen-tools] difference between xen-shell and argo

Hi,
I hope this is the right list - couldn't find extra adresses of
Mailing lists for xen-shell and argo - couldn't even see a Link to
this list here on xen-tools.org - but maybe I'm too blind currently.

Simple question: I'll try them myself as soon as I find the time,
maybe someone cann tell me on a short notice the differences between
xen-shell and argo.

Some are obvious: xen-shell doesn't seem to have a GUI, argo seems to
have  no way to re-install machines.

Apart from that, I am not sure what exactly the differences and
commonalities are, and the descriptions sound quite similar.

Henning