Let's say I have a pc connected to a node.  On another node, I have another pc.  I would like to use VPN or even access a share on the first pc from the second.   How can I find the ip address of that machine?  

Will bbhn pass netbios names?

I have looked in the node status and olsr pages but can't find what addresses are being assigned to machines attached to nodes.   

Thanks.

This is really the same as you would deal with it in any IP network.

If the system is suppose to be accessible by others the best bet would be to actually advertise a name under the DHCP Lease setup.

Second to that assuming you have admin permissions on the remote node in question looking at Setup > Port Forwarding, DHCP, and Services >  DHCP Leases  will let you see each IP address that has a current lease (and can assign a name to it if you choose)

Failing that the best way to get the details would be from the PC itself  using ipconfig/ifconfig (depending on operating system)

NetBios names will not be passed over the mesh as each node is a router break location which stops broadcast NetBios advertisements

Of course all this assumes Direct mode, if your in NAT mode you will have to setup port forwards as the PC's LAN IP will not be routed over the mesh.

Thanks!