I'm trying to set up a pair of virtual (Win 2008 Server) servers on my laptop for demo'ing Velocity. I've got my first server setup with VirtualBox, but I'm slightly clueless about how to set up the networking so that host and guest can talk to each other. Both guests will also need to be able to talk to each other. The guests don't need to be able to talk to the outside Internet though it may be nice to have.
Do I need a virtual network? How do I set it up?