Yes, it is possible to give access to a new client to view his website even before he transfers DNS to your service.
Hosting Controller can create instant access for new website under a live domain, preferably under your company domain. The customer may then access his website as http://HostWebSite/CustomerWebSite.
To enable instant site access, follow these steps:
Login as Reseller and click IIS Settings under Preferences menu.
Select a site to host instant access for new websites from Website for Name Based Domains drop-down select box. Click Save Settings button.
Consider 'SpicyHost.com' is selected as Website for Name Based Domains and new website 'GigaTraffic.com' is signed-up. Hosting Controller will create a virtual directory 'GigaTraffic-com' under 'SpicyHost.com'. In account setup e-mail client will be notified about this URL and then the client will upload and see his website at http://SpicyHost.com/GigaTraffic-comhttp://SpicyHost.com/GigaTraffic-com.