virtuell account (domain name) before registering a domain

[wpoolman]

in confixx i could give a client before i registered him a virtuell account (domain name) where he could test his application.

he could also reach the page through the url like
web123.client.asweb.com

he could view all pages, as if he works on real domain.

after i registered clients domain, he could reach his pages

1) domain name
2) still virtuell domain name


now i have clients in plesk 8.0, who also needs these temporary domain names to test their applications. at this juncture they have no domains.

HOW TO ?? can anyone help please!!!


regards
walter