Extra domains with ISPConfig on server

[TheRudy]

This is just theoretical questions as i don't have my server yet and can't really check it..

Is it possible to create extra virtual domain names on server running ISPConfig and that those domain names are not anywhere in ISPConfig or that they don't interfear with it?

Why?
Free forum hosting offering users the ability to use their own domain name.

On the other hand, is it possible to set just domain name in ISPConfig without hosting account and that this domain name points to for example: 'DomainName.com/user' ?