set up a website with an email form, the user is asked for an alias and the details of their problem. after they press send it says “your message was sent, please take note of your serial number to be able to receive replies, your number is (number:#000–0XXXX)” then, on the main page of the site, there is a box that asks for the secret serial number, when they type in their number they are taken to a place where they are shown in private their advice. you will need: a domain name, a basic hosting package that supports php and mysql, a little javascript and some html and css to put it together.