WestLife VRE will use WP6 appliance as storage backend. WP6 appliance will allow users to mount locally their virtual folder, and will also serve as a "storage service backend API" for the VRE, and for WestLife e-science portals. You send user credentials to this API and you get in return the aggregated view of all scattered data = virtual folder.
Currently VRE uses a custom API for connection with various storage services. Transition is on the way to use WP6 work.