Ispconfig + Webmin Questions

[kendel]

I noticed a few posts that said it can be done, since ispconfig doesn't really do administration...
Do you install webmin first, then configure ispconfig or do you do all the configurations of ispconfig and then install webmin? Does any one have any experience? and can webmin auto detect features already installed on the server because I know you can do installations from the webmin gui. but Can it already detect if a package was already installed.