Today I learnt something new. I had not previously heard the term VRF (well not that I can remember anyway.)
It means Virtual Routing and Forwarding.
Here is a link to the Wikipedia page: http://en.wikipedia.org/wiki/Virtual_Routing_and_Forwarding and a link to the documentation on Cisco’s website: http://www.cisco.com/en/US/docs/net_mgmt/vpn_solutions_center/1.1/user/guide/VPN_UG1.html
It looks like it could be really useful.