If you add the /autodelete parameters to the command to start AppPortal (for example “C:Program FilesQuest SoftwarevWorkspace Clientpnap32.exe” /di /autodelete” ) all farm definitions will be deleted and the AppPortal Client will be reconfigured using the auto-configuration feature of vWorkspace. For more information on how to auto-configure vWorkspace clients read this blog post.

Our customers typically use this feature if they want to have central control over configuration of all clients without the need to visit or connect to each client machine. Updating the configuration of 1000’s of clients becomes a breeze using the auto-configuration feature of vWorkspace in conjunction with the /autodelete parameter!

Source: http://blogs.inside.quest.com/provision/2009/06/28/how-to-use-the-autodelete-option-with-vworkspace-appportal/