define 'a system' ;) I could make you some command line tools to create and delete accounts (i.e. set up the directory, set up the subdomain, whatever else the user needs done to be created) that you could then call from your php pages when accounts are created. If you need the pages on your existing site edited I would need to see it before I could give you a quote for doing that but it shouldn't be a big issue to put the commands into the logic of the registration page and in the backend where you delete users.