Has anyone ever tried making a single-point login for multiple sites?

[hippostarz]

I'm working on starting a web hosting company that uses CMSMS as part of a basic website template/content/module management platform for my customers to use to access and modify their sites.  I plan on setting up most of the templates myself for now.  It would be great if all of my customers could come to my main company website to login and manage their prospective sites. Is this possible?  I have throught about using provisioning software (like Plesk, Helm, or c-Panel) that would install a new instance of CMSMS... I could do it that way, but that would give the end user access to probaby more than they would need.  I'm trying to make it as simple as possible for the end users "Real Estate Agents".   Which do you guys think would be smarter and why?

I'm fairly new to CMSMS and template based webhosting, but I've recently used CMSMS to implement a site and I'm completely impressed with it's flexibility and simple ease of use.  I'm hooked, what a great platform!  Looking for some experienced guru advice.

Many thanks in advance!

- Hippostarz

[Farnsworth]

i M new to CMSMS my self but i am working on something close to what you are working on as well and having 1 login for my site,
as well as a quick way of editing pages and posting info.

your question about using cpanel or plesk you should check out Fantastico as well they are really great ways to let people have total control over a site, i can not think of the name but there is server programs around that are for people who set up and resell server space and assuming you have a site license for plesk or cpanel it would set every thing up for the user.

i am sure this could be done with CMSMS but i know there are programs around that do this already, i just do not know how much they cost.